Answer:
16 hap rest
Explanation:
The development of artificial blood was fueled by the increased number of HIV cases, threatening an increase in the amount of contaminated blood available for blood transfusion, especially in___.
Explanation:
The development of artificial blood was fueled by the increased number of HIV cases, threatening an increase in the amount of contaminated blood available for blood transfusion, especially in areas where the prevalence of HIV is high. This includes regions with high rates of HIV transmission, such as sub-Saharan Africa, where many people rely on blood transfusions to treat medical conditions. The risk of HIV transmission through blood transfusions was a major concern in the development of artificial blood, which aimed to provide a safe and effective alternative to traditional blood transfusions.
Answer:
The development of artificial blood was fueled by the increased number of HIV cases, threatening an increase in the amount of contaminated blood available for blood transfusion, especially in the 1980s and early 1990s. During this time, the HIV/AIDS epidemic was rapidly spreading, and many people were becoming infected with the virus through blood transfusions. This led to a shortage of safe blood for transfusions, and there was a critical need for an alternative to human blood. The development of artificial blood was seen as a way to address this problem and provide a safe and reliable source of blood for transfusions, particularly for people at high risk of contracting HIV/AIDS.
Which of the following are possible explanations for the strange occurrence of iridium in the Earth's crust in Wyoming? Choose more then one if needed
The rock around this streak changed into iridium.
An asteroid made up of iridium crashed into the Earth.
The scientists were wrong and iridium is more common on Earth
than previously thought.
The streak of iridium in the Earth's crust in Wyoming indicates a
time when Earth was bombarded by asteroids.
The appearance of iridium in Earth's crust is probably due to
animal activity.
The heat from the sun probably converted minerals in Wyoming's
crust to iridium.
The streak of iridium in the Earth's crust in Wyoming indicates a time when Earth was bombarded by asteroids of the following are possible explanations for the strange occurrence of iridium in the Earth's crust in Wyoming
Is iridium one of the most scarce metals found in the crust of the Earth?Only rhenium, ruthenium, and rhodium are rarer elements than iridium, which is the fourth rarest element in the Earth's crust. Yet, between the Cretaceous and Paleogene geological eras, 65 million years ago, Luis Alvarez and his team of researchers discovered a strange thin layer of iridium-rich clay in 1980.
Both its melting temperature and density are quite high. The substance with the greatest resistance to corrosion is iridium.
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You are going to use the enrichment culture technique to isolate Gram negative, aerobic, N2-fixing bacteria from a sample of soil. You will need to design a defined medium which will allow you to enrich for Gram negative, aerobic, N2-fixing bacteria. Which of the following ingredients would you want to include in your defined medium? - vitamins - Trace Element Solution - air (O2 + N2) - MgSO4 - KCl - glucose - Penicillin - yeast extract - Na2HPO4 - NH4Cl
Vitamins, Trace Element Solution, [tex]KCl[/tex], air ([tex]O_{2} + N_{2}[/tex],) , [tex]MgSO_{4}[/tex], [tex]Na_{2} H PO_{4}[/tex] will be needed to include in the defined medium to enrich for gram negative aerobic, Nitrogen-fixing bacteria.
To isolate Gram negative, aerobic, N2-fixing bacteria from a sample of soil, the trap plants were inoculated with a 1 mL suspension of soil sample taken from each of the seven locations in order to isolate nitrogen-fixing bacteria.
A collection of Gram-negative, nitrogen-fixing, free-living aerobic bacteria called Azotobacter and Rhizobium live in soil.
Rhizobia are Gram-negative bacteria that cause their host leguminous plants to develop specialised structures known as root nodules. As soon as the clusters are infected, they develop into nitrogen-fixing bacteroids. The symbiotic relationship is preceded by a complex signal exchange.
Azotobactor are aerobic, free-living soil microbes that are essential to the nitrogen cycle in nature because they capture atmospheric nitrogen that plants cannot use and release it into the soil as ammonium ions. (nitrogen fixation).
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Scientists discover a new species they call swamp cactus. It has three interesting genes that are unlike any they've previously seen. The scientists characterize the root morphology phenotypes as branched being dominant to twisted. Its spines can be spiked (dominant) to limp (recessive). And its fruit color can be neon green (dominant) to fuchsia (recessive).
The scientists agree that these genes are linked, but need to map the three genes along the chromosome. They perform a three-point test cross involving these traits. In the test cross, a true breeding branched, spiked, and neon parent is crossed with a true breeding twisted, limp, and fuchsia parent. All the F1 are branched, spiked, and neon, as expected. The F1 is crossed with a tester. The F2 progeny numbers are listed below. Table 1. Number of offspring from a three point test cross involving the swamp cactus root, spines, and fruit genes. phenotypic class number of offspring branched spiked neon 629 branched spiked fuchsia 31 branched limp neon 212 branched limp fuchsia 150 twisted spiked neon 158
twisted spiked fuchsia 214 twisted limp neon 30
twisted limp fuchsia 545 0.5 pts What is the distance between the root and fruit genes? Enter in only a numerical answer with one decimal place and without map units. Which phenotypic classes are single crossover recombinants for the spines to fruit genes? Select all that apply.
- branched spiked neon - branched spiked fuschia - branched limp neon - branched limp fuschia - twisted spiked neon - twisted spiked fuschia
- twisted limp neon - twisted limp fuschia D What is the distance between the spines and fruit genes? Enter in only a numerical answer with one decimal place and without map units.
The distance between the root and fruit genes is 15.8 units. The phenotypic classes that are single crossover recombinants for the spines to fruit genes are: branched spiked fuchsia, branched limp neon, twisted spiked neon, and twisted limp fuchsia. The distance between the spines and fruit genes is 10.0 units.
The scientists discovered a new species of cactus called the swamp cactus that has three unique genes for root morphology, spine type, and fruit color. In order to map these genes on the chromosome, they performed a three-point test cross. The resulting F2 progeny data allowed them to determine the distances between the genes.
The distance between the root and fruit genes was found to be 33.3 units, while the distance between the spine and fruit genes was 8.7 units. The phenotypic classes of the single crossover recombinants for the spine to fruit genes were branched spiked fuchsia and twisted limp neon.
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Limestone is a natural material that brings the sense of beauty and nature into a home. It can be used in a number of ways and is highly popular for flooring, as well as countertops. Limestone is a sedimentary rock.
Name the process through which limestone is formed.
1.Rock cycle
2.Water cycle
The process by which limestone is produced rock cycle.
How does limestone form during the cycle of rocks?As calcite or aragonite precipitates out of water that contains dissolved calcium, limestone is created. This process can happen through both biological and non-biological means. The concentration of dissolved carbon dioxide (CO2) in the water has a significant impact on the solubility of calcium carbonate (CaCO 3).
Which stage of the geological cycle would a limestone form in?The majority of limestones are formed in shallow, warm, quiet, and transparent waters. Environments like that allow creatures that can build calcium carbonate shells and skeletons to flourish and easily collect the necessary components from ocean water.
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Irrigation _____ often results in a salt residue in topsoil, decreasing soil fertility.
Please choose the correct answer from the following choices, and then select the submit answer button.
Answer choices
with ocean water
onto salt flats
on mountain slopes
in hot, dry areas
Answer:
in hot, dry areas
Explanation:
What's The answer ?????
Ferns
Explanation:
"Ferns are a natural inhabitant of shady areas"
Ferns live in shady areas. So do Oxalis but they do not live in a lot of shade. So Ferns.
Scientists often use controlled experiments to answer questions. Choose the three correct statements about controlled experiments.
In controlled experiments, one (or a few) variables are altered at a time while all other variables are held constant. This is a controlled environment for conducting scientific studies.
Which of the following is true regarding a controlled experiment?One variable is examined at a time in a controlled experiment while the other variables are held constant or unchanged.
What are the purposes of controlled experiments in science?Beyond methodology, controlling an experiment is essential to make sure that the observed results are not merely random occurrences; they aid scientists in separating the "signal" and the background "noise" that are present in all natural and biological systems.
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6. Assume that eye color in humans is controlled by a single pair of genes of which
the effect of that for brown (B) is dominant over the effect of that for blue (b). (a)
What is the genotype of a brown-eyed individual who marries a blue-eyed indi-
vidual and produces a first offspring that is blue-ayed? (b) For the same mating as
in (a), what proportions of the two eye colors are expected among further offspring?
(c) What are the expected proportions of eye colors among the offspring of a mat-
ing between two brown-eyed individuals who each had one parent that was blus-
eyed?
Explanation:
(a) The genotype of the brown-eyed individual would be Bb, since they have a dominant B allele for brown eyes and a recessive b allele for blue eyes. The blue-eyed individual would have a genotype of bb.
(b) The offspring of the Bb x bb mating would have a 50% chance of inheriting the b allele from the Bb parent and a 50% chance of inheriting the b allele from the bb parent. Therefore, the expected proportions of the two eye colors among further offspring would be 50% brown-eyed and 50% blue-eyed.
(c) Each of the brown-eyed individuals who had one parent that was blue-eyed would be heterozygous Bb. Therefore, the expected proportions of the offspring's genotypes would be 25% BB, 50% Bb, and 25% bb. Since the B allele is dominant, the expected proportions of eye colors among their offspring would be 75% brown-eyed and 25% blue-eyed.
Response to its environment (nervous system? sense organs? special adaptations?)
african bush elephant...... can I get some help?
A variety of adaptations and skills enable the African bush elephant to adjust to its surroundings and thrive in its natural habitat.
What adaptations do African bush elephants make to their surroundings?Elephants have huge bodies, which help them regulate their body temperature in the scorching sun, dig for water with their tusks, and use their trunks to grasp branches and other objects.
What sensory reactions does an elephant have to its surroundings?Elephants can smell water sources up to 19.2 km (12 mi) distant thanks to their excellent sense of smell. At the apex of the trunk are the nostrils, which are used for breathing, smelling, and pulling in water to squirt into the mouth.
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When many molecules bond together, they form a macromolecule. Complete the table to identify the four main types of macromolecules that are necessary for life. Then identify the monomers and elements that compose them.
answer only needed for 5
While not technically a macromolecule, water is also necessary for life and is composed of hydrogen and oxygen atoms.
What is Macromolecules?
Macromolecules are large molecules made up of smaller molecular subunits called monomers. These monomers can be identical or different and are linked together through covalent bonds to form a larger, more complex molecule. Macromolecules are essential for life, as they play important roles in biological processes such as metabolism, energy storage, and information storage and transfer. The four main types of macromolecules found in living organisms are carbohydrates, proteins, lipids, and nucleic acids.
Macromolecules are generally formed through a process known as polymerization, where many monomers are covalently bonded together to form a polymer. The process of polymerization can occur through a variety of mechanisms, including dehydration synthesis, where water is removed to form the covalent bond between monomers, and hydrolysis, where water is added to break the bond between monomers.
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All
bivibni evig tom
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1. The table displays data about the presence of certain traits in a population of chickens over several
generations. The data provide evidence that best supports the claim that these chickens are being
bred for which characteristic?
The data provide the strongest evidence for the claim that breeding of chickens is done for large bodies.
What is Poultry breeding?Poultry breeding is the practice of selectively breeding and raising domesticated birds such as chickens, turkeys, ducks, geese, and quails for the purpose of improving their desirable traits such as meat quality, egg production, growth rate, disease resistance, and temperament.
The process of poultry breeding involves selecting the best birds from a flock based on specific criteria, such as body size, weight, conformation, and feather quality. These birds are then bred together to create a new generation of birds with improved genetics, which will hopefully exhibit the desired traits in greater measure. The process is repeated over multiple generations until the desired traits are fixed in the population.
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Why is the error rate for bacterial DNA replication very low?
The error rate for bacterial DNA replication is very low due to the presence of several proofreading mechanisms and repair systems that operate during and after the replication process.
These mechanisms work together to detect and correct errors in the newly synthesized DNA strands, ensuring high fidelity in the replication process. Here are some key reasons why the error rate is kept low:
DNA Polymerase Accuracy: DNA polymerase is the enzyme responsible for synthesizing the new DNA strand during replication. Bacterial DNA polymerases have evolved to be highly accurate in incorporating the correct nucleotides during replication.
Proofreading Activity: Many bacterial DNA polymerases possess a 3' to 5' exonuclease activity, also known as the "proofreading" activity. During replication, if an incorrect nucleotide is added to the growing DNA strand, the proofreading activity allows the DNA polymerase to remove the mismatched nucleotide before continuing with replication.
Mismatch Repair: Bacteria have specific mismatch repair systems that function to correct errors that escape the proofreading activity. These repair systems detect and remove mismatches between the newly synthesized DNA strand and the template strand, thus further reducing replication errors.
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In fruit flies, grey color is dominant over black color and normal sized wings are dominant over vestigial wings. Suppose a true breeding line of grey fruit flies with vestigial wings is mated with a true breeding line of black fruit flies with normal wings. The F1 generation is then crossed. Draw a Punnett square to show the genotypes of the F2 generation, and give the phenotypic ratio for the F2 generation.
The phenotypic ratio is: 9 grey normal : 3 black normal : 3 grey vestigial : 1 black vestigial.
Phenotypic ratio is the ratio of different observable traits or physical characteristics (phenotypes) in a population or offspring resulting from a particular genetic cross or breeding.
The parental genotypes are:
Grey (GG) with vestigial wings (vv): GGvv
Black (gg) with normal wings (VV): ggVV
The F1 generation will all be heterozygous for both traits (GgVv).
The Punnett square(See Table) for the F1 cross is:
So, the genotypic ratio of the F2 generation is:
1 GGVV : 2 GGVv : 1 GgVV : 2 GgVv : 1 ggVV : 2 ggVv : 1 ggvv
And the phenotypic ratio is:
9 grey normal : 3 black normal : 3 grey vestigial : 1 black vestigial.
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when tat protein fails to bind the tar region of the hiv transcript, which of the following is true: A. rna polymerase ii terminates transcription B. cyclin t does interacts with the cdk9 C. cdk9 acts on the snrnp proteins necessary for proper slicing of the mature hiv transcript D. the ctd of rna polymerase ii is dephosphorylated
When tat protein fails to bind the tar region of the hiv transcript rna polymerase ii terminates transcription.
A is the correct answer.
The transcriptional activator Tat, which plays a critical role in HIV-1 replication by binding to the TAR hairpin at the 5′ end of freshly formed RNA transcripts, is one of the early viral proteins.
From many lentiviruses' transcriptional transactivators (Tat) interact with their cognate transactivation response RNA structures (TAR) to boost rates of elongation rather than transcription initiation.
Several of them require the formation of a combination of Tat and a species-specific cyclin T1 before binding to TAR with high affinity and specificity.
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3 real-world examples of homeostasis
Creep feeding can help them make the transition without such a setback, and it can also help them begin to produce the enzymes needed to digest nonmilk proteins.
In animal husbandry, the technique of creep feeding includes giving supplemental food to nursing young while they are still ingesting their mother's milk.
One of the main advantages of creep feeding is that it can make the transition from liquid to solid feed easier for young animals without causing them to experience a substantial slowdown in growth or development. While the young animal is still nursing, the solid feed can be introduced gradually so that it becomes used to the taste and texture and starts to generate the enzymes needed to break down non-milk proteins.
Creep feeding is a practical method for encouraging young animals to grow and develop normally and ensuring they get the nutrients they need to survive. To establish a feeding plan suitable for the animal and consider its unique needs and requirements, you should consult a veterinarian or animal nutritionist. You should also carefully check the animal's growth and development to ensure it is developing as it should be.
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Whats the answer ??????
Two nomenclature systems are used to name amino acids: The classic one using triplets and the modern one using a single letter. option is C) A W Q L N.
How to name amino acids?
There are two nomenclature systems to name amino acids.
1) the classic one uses three letters -the triplet- to represent a single amino acid.
When constructing the polymer, triplets are separated by dashes. In this representation, the primary structure of the molecule begins with the amino-terminal extreme (N) and finishes with the carboxy-terminal extreme (C).
Each triplet is a codon that codes for an amino acid.
- There is a start codon (ATG) that codes for Methionine. This is always the first amino acid to be added to the chain.
- There are three different stop codons (UAA, UAG, UGA) that indicate where the protein synthesis must stop.
2) The modern system uses a single letter to identify each amino acid.
When representing the primary structure of the molecule, these letters do not need to be separated by dashes. The amino-terminal extreme (N) is located on the left, while the carboxy-terminal extreme (C) is located on the right of the molecule, just as in the other system.
In the exposed example,
Codon Amino acid (classic system) Amino acid (modern system)
GCA Ala A
UGG Trp W
CAG Gln Q
UUA Leu L
AAU Asn N
According to this table, the correct option is C) A W Q L N
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Name the organ/structure labeled with the number 13.
Answer:
Explanation:
put the picture of the question ty
Select the correct answer from each drop-down menu.
A neuron has three basic parts: the dendrites, the cell body, and the axons. Some neurons have a fatty layer covering called
around their axons. This layer isn’t continuous, and the gaps are called
. The action potential jumps through these gaps to
the transmission.
Answer:
1. Myelin Sheath
2. Nodes of Ranvier
3. Regenerate
Explanation:
Which best summarizes the concept of natural selection?
O A. Organisms best adapted to their environments survive.
O
B. The oldest organism is the fittest for survival.
C. An organism will always mutate to survive.
O
D. The fittest organisms have the fewest offspring.
Organisms best adapted to their environments survive best summarizes the concept of natural selection.
What is Natural selection?An evolutionary mechanism is natural selection. Environment-adapted organisms have a higher chance of surviving and dispersing the genes that contributed to their success. Over time, this mechanism leads to the evolution and divergence of species.
One way to explain the millions of species that have existed on Earth is through natural selection.
The idea of evolution by natural selection is credited to Charles Darwin (1809-1882) and Alfred Russel Wallace (1823-1913), who co-wrote a paper on it in 1858.
Therefore, Organisms best adapted to their environments survive best summarizes the concept of natural selection.
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Biologists have observed that kangaroo rats living in desert habitats change their diet from dry seeds to vegetation and insects depending on the season. Based on this information, which statement is most likely true?
The most likely true statement based on the information is that kangaroo rats adapt their diet to changes in their environment and food availability.
Specifically, they shift their diet from dry seeds to vegetation and insects depending on the season. This ability to adapt to changing conditions is an important survival strategy for animals living in harsh environments like deserts, where food resources can be limited and unpredictable. It also highlights the importance of understanding the ecological context in which an organism lives, as well as the complex interactions between organisms and their environment.
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In layers of rock, the rock on the bottom layer is what?
Answer:
According to the Principle of Superposition (as stated in search result [10]), in an otherwise undisturbed sequence of sedimentary strata , or rock layers, the layers on the bottom are the oldest. Therefore, in layers of rock, the rock on the bottom layer is the oldest.
Answer:
The rock on the bottom layer of a rock formation is usually the oldest, as it was formed first and then covered by subsequent layers of rock over time. This is due to the principle of superposition, which states that in an undisturbed sequence of layers, the oldest layer is at the bottom and the youngest layer is at the top.
A graph illustrating the change in pulse rate of a 16-year-old during
circuit training.
9 (a) Which of the following best describes what is
happening at Point D on the graph? (1)
A Warming up
B Cooling down
C Working at a station of the circuit training
programme
D Resting in between stations of the circuit
training programme
(b) Look at the graph and explain what is happening at
each of the points labelled A to E. (5)
Answer:
Working at a station of the circuit training programme
By the end of an individual's life, this genetic material is very short in length.
Ochromosomes
O telomeres
O neurons
Ocells
The correct answer is "telomeres."
What is Telomeres ?Telomeres are the protective caps on the ends of chromosomes that gradually shorten as a person ages. Each time a cell divides, the telomeres get shorter, and eventually, they become too short to protect the chromosomes properly. This can lead to cellular aging, DNA damage, and an increased risk of disease.
When the telomeres become critically short, the cell can no longer divide and enters a state of senescence or programmed cell death apoptosis.
Therefore, telomere length has been associated with aging and age-related diseases.
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b) Explain why the cells found in region A have microvilli on their border and many mitochondria.
The presence of microvilli but few mitochondria aids a cell's capacity to successfully accomplish its secretion or absorption functions.
What are the microvilli used for?Thousands of densely packed microvilli protrude from each small intestinal cell, forming a brush border that both absorbs nutrients and shields the body from intestinal microbes.
Microvilli are cytoplasmic protrusions that resemble fingers and are present on the surface of many different types of cells.
The mucosa of the intestine and the proximal tubule of the kidney are examples of simple epithelial cells on which they are most frequently found and elaborated.
Therefore, The presence of microvilli but few mitochondria aids a cell's capacity to successfully accomplish its secretion or absorption functions.
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QUESTION - why the cells found in region A have microvilli on their border and many mitochondria. explain.
Compare and contrast how the circulatory system is important to obtaining raw
materials and excreting byproducts of cellular respiration.
The circulatory system plays an important role in both obtaining raw materials and excreting byproducts of cellular respiration.
What is cellular respiration?Cellular respiration is a metabolic process in which living organisms convert nutrients such as carbohydrates and proteins into energy. During this process, energy is released from the molecules and used to produce adenosine triphosphate (ATP) molecules.
Obtaining raw materials: The circulatory system is responsible for transporting oxygen and other essential molecules to cells, which are then used as fuel for cellular respiration. Oxygen is obtained from the lungs and is transported through the bloodstream to the cells. Nutrients, such as glucose and amino acids, are also transported via the circulatory system for the purpose of providing energy to cells.
Excreting byproducts: The circulatory system is also responsible for carrying away the byproducts of cellular respiration, such as carbon dioxide and other waste products. These byproducts are transported away from the cells, to be released as gas or excreted in the form of urine.
In summary, the circulatory system is essential to cellular respiration, as it facilitates the transport of both the raw materials and the byproducts. Without the circulatory system, cells would not be able to obtain the necessary materials for respiration, nor would they be able to expel the waste products in an efficient manner.
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why are primary producers important to the survival of primary, secondary, and top level consumers within a marine ecosystem?
Primary producers are important to the survival of primary, secondary, and top level consumers within a marine ecosystem because they are the base of the food chain.
What are some examples of primary producers in marine ecosystems?Some examples of primary producers in marine ecosystems include phytoplankton, algae, seagrasses, and mangroves. These organisms are able to capture energy from the sun and convert it into organic matter through photosynthesis.
What are the consequences of a loss of primary producers in marine ecosystems?A loss of primary producers in marine ecosystems can have cascading effects throughout the food chain. Without enough energy from primary producers, populations of primary, secondary, and top level consumers may decline or disappear.
This can lead to imbalances in the ecosystem and the loss of important ecological functions, such as nutrient cycling and carbon storage. Additionally, the loss of primary producers can have economic impacts on industries that rely on fisheries and other marine resources.
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In which of the following animals are the blood and the interstitial fluid considered to be the same body fluid?
A grasshoppers
B fishes
C sparrows
D dogs
E jellyfish and cnidarians
In grasshoppers blood and the interstitial fluid are considered to be the same body fluid as they have a open circulatory system.
A is the correct answer.
The open circulatory system is a type of circulatory system in which the cells actively bathe in blood. It is a distinguishing trait of arthropods and mollusks. Grasshoppers have an open vascular system and are arthropods. The heart pumps blood into open-ended arteries in the open circulatory system.
As a result, blood and interstitial fluid are not distinct and are referred to jointly as hemolymph. The hemolymph exits the blood vessels and enters the large spaces known as sinuses. The hemolymph bathes their body tissues. In arthropods, the heart has openings that enable hemolymph to enter.
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I need help the assignment is an savvas assignment it’s called “the genetic code
Answer: split them into section 3 letters in a section. In the 2nd section n the left you would notice AUG that’s your start code, circle that and at the very end circle UAG that’s a Stop code
Explanation: