The fossil record is the information we need to research to investigate the origin of life on Earth.
How do we know the origin of life on Earth?The earliest evidence of life on Earth comes from fossils that are discovered in Western Australia which is about 3. 5 billion years ago. These fossils are the structures called stromatolites which are formed by the growth of a layer of single-celled microbes such as cyanobacteria.
The major source to know the history of life on earth is fossil records. Fossils are the remains of organisms that are present centuries ago. They form when an organism dies and is burry in dirt and is solidified by minerals.
So we can conclude that fossils are the information that shows the life of the earth.
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If all of the stratospheric ozone suddenly disappeared, ________. A) plants would flourish
B) there would be a dramatic decrease in skin cancers
C) most life on Earth would cease to exist because of the amount of UV radiation penetrating the atmosphere
D) insects would be the only organisms to survive
E) Earth's surface would warm considerably
Answer:C
Explanation:
In a high latitude rainforest,the dominant type of photosynthesis is most likely to be
A) both C3 and CAM.
B) C4.
C) CAM.
D) both C4 and CAM.
E) C3.
The disadvantage of C4 photosynthesis is the additional energy, in the form of ATP, required to pump the 4-carbon acids to the bundle sheath cell and the 3-carbon complex back to the mesophyll cell for PEP production.
What kind of molecule makes up a photosystem's reaction center?A crucial chlorophyll molecule is located in the center. One of its electrons is elevated to a higher energy when it absorbs light. After passing through a number of other colored molecules and onto plastoquinone A, this supercharged electron moves downhill before crossing over to plastoquinone B.
Why do C4 plants thrive in tropical climates?For these plants, where the environment favors both water loss and the irritating photorespiration reactions caused by RUBISCO.
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What could occur if the feedback loop of the knee reflex was cut off at any point along its path?
This is an illustration of a reflex, which is an uncontrollable muscle reaction brought on by the tap of a rubber hammer on a tendon.
What is a feedback loop?
The absence of reflex reactions may indicate injury to the spinal cord, a nerve root, a peripheral nerve, or a muscle.
Two positive feedback loops are involved in the defecation reflex. These loops are the stretch receptors in the sacral parasympathetic system and the rectal walls.
Therefore, a reflex is an uncontrollable muscle reaction brought on by the tap of a rubber hammer on a tendon.
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Sickle disease cell is a recessive genetic disorder. How many copies of the mutated gene (HbS allele) do you need to develop full blown sickle cell anemia?Please explain as well
If a bot gets first, Ill give the person who gives a correct answer 30 points and brainliest.
Answer:
It takes two copies of the mutant gene.
Explanation:
One from each parent, to give somebody the all-out sickness. Numerous individuals have only one duplicate, the other being typical.
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1. The carrying capacity for a population of deer in a forest is 300 individuals.
Which of the following is true?
A population of 300 deer will remain at about 300
A population of 100 deer will remain at about 100
A population of 500 deer will continue to grow exponentially
A population 300 deer will run out of resources and crash
The organisms found in a coral reef habitat include clownfish, seahorses, and sea grass.
2. Which of the following terms best describes these organisms?
community
biome
species
population
3.Which of these is an abiotic factor in a tundra ecosystem?
amount of sunlight
trophic levels
species richness
vegetation
Answer:
1. A population of 300 deer will remain at about 300
2. community
3. amount of sunlight
Explanation:
1. Carrying capacity is defined as the maximum population size of a biological species that can be sustained by that specific environment, given the food, habitat, water, and other resources available. Therefore if a population has reached its carrying capacity, it will most likely remain at that size.
2. A community is defined as all of the populations of different species that live in the same area and interact with one another. Clownfish, seahorses, and sea grass are all different species living in an area together and interacting with each other. This example does not show a population, nor a species, nor biome, since a population is a group of organisms of the same species, and a biome is a distinct biological community that has formed in reponse to a shared physical climate.
3. Abiotic factors are non-living factors which affect an ecosystem.
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Why was penicillin considered a miracle drug?
A. It is made from mold.
B. It cures deadly diseases.
C. It prevents bacterial infections.
D. It was discovered during World War I.
Hi they
B is answer
why? well because when they discover it this changes the world. this drug helped with infections or bacterial and more.
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Which of the following is an important step in the preparation of a proper bacterial smear?
a. Allow the loop to cool after it has been flamed.
b. Label the underside of the slide (the downward-facing side of the slide) with the type of microbe you will be transferring.
c. Repeat inoculations such that the smear is as thick and undiluted as possible.
d. Apply methane to clean the slide prior to smearing inoculum.
Allow the loop to cool after it has been flamed is an important step in the preparation of a proper bacterial smear
A bacterial smear is a small layer of bacteria that is deposited on a slide or a tray for staining. The bacteria are fixed on the slide, and this stops the bacterial sample from being washed away during staining. A crucial step in creating a healthy bacterial smear is allowing the loop to cool after burning.
This is due to the fact that blazing the loop sterilises it by eliminating any bacteria that may be present on the loop, but if the loop is still hot when a sample is taken, the bacteria may be "fried" rather than collected. For effective identification and analysis, it is crucial that the bacteria are gathered in their natural state, which is ensured by allowing the loop to cool.
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Which situation can be identified by a biodiversity study of an area?
© A. A currently undetected invasive species will invade the ecosystem.
• B.
The decline of a shrub species is caused by an increase in an herbivore population.
O C. A flood is likely to hit the area very soon.
• D.
The ecosystem will expand its geographical range in the next 50 years.
O E.
An animal species is experiencing altered reproductive function.
Answer:
d
Explanation:
Answer:
D is WRONG
Explanation:
The correct answer is B
Position A represents the position of the sun at another time of day during month Z. What is the time of day when the sun is at position?
Answer:
Position of the Sun. On Monday, September 16, 2019 at 02:30:00 UTC the Sun is at its zenith at Latitude: 2° 48' North, Longitude: 141° 16' East. The ground speed is currently 463.40 meters/second, 1668.2 kilometres/hour, 1036.6 miles/hour or 900.8 nautical miles/hour (knots).
Explanation:
The time of the day is 1 p.m when sun is at position A.
What is the distance between earth and sun?As noted earlier, Earth's average distance to the Sun is about 93 million miles (150 million kilometers) from the Sun.
Position of the Sun. On Monday, September 16, 2019 at 02:30:00 UTC the Sun is at its zenith at Latitude: 2° 48' North, Longitude: 141° 16' East. The ground speed is currently 463.40 meters/second, 1668.2 kilometres/hour, 1036.6 miles/hour or 900.8 nautical miles/hour.
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all pigments in the chloroplast can absorb sunlight and can participate directly in photosynthesis. What is your opinion about this statement
Answer:
One very important chlorophyll is chlorophyll a. All photosynthetic organisms (except a few groups of bacteria) have this as their main photosynthetic pigment. It is important because only it can participate directly in the light reactions, which convert solar energy to chemical energy.
Explanation:
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Enzyme A catalyzes a cellular reaction found in a wide range of species. The table shows data collected on the turnover numbers of Enzyme A purified from two of these species. In both cases, the same conditions were used to measure turnover numbers. Which statement is consistent with these data
ΔG for the two reactions is the same, but the energy of activation for the reaction catalyzed by the mollusk enzyme is lower than the energy of activation for the reaction catalyzed by the bacterial enzyme.
Enzymes are proteins that act as biological catalysts by hastening chemical reactions. Substrates are molecules that enzymes may interact with, and the enzyme converts the substrates into other compounds known as products.
An enzyme is a substance that works as a catalyst in living organisms, controlling the pace at which chemical reactions occur while remaining unaffected. Enzymes play a vital role in decreasing a reaction's activation energy—the amount of energy required for the reaction to begin. Enzymes function by attaching to reactant molecules and keeping them in place so that chemical bond-breaking and bond-formation activities may occur more easily.
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What happens when the livestock
grazing on rangelands remove ALL or
MOST of the grass cover?
A. it depends on the species of grass
B. nothing - the grass just grows back
C. soil erosion from wind and water occurs much quicker
D. the less rain can reach the soil
Answer:
C
Explanation:
soil erosion from wind and water occurs much quicker
Are these correct? And can you finish them?
Answer: Yes and here are the rest in order: Ozone layer, oxygen, nitrogen, water, ice, planet, and moon
Explanation:
Answer: Seems good
Explanation: Ozone layer, Oxygen and Nitrogen, Water, Ice, Planet, Moon
How is it beneficial to living things[ humans, animals, plants, etc] and the environment?
Answer:
ost plants and animals live in areas with very specific climate conditions, such as temperature and rainfall patterns, that enable them to thrive. Any change in the climate of an area can affect the plants and animals living there, as well as the makeup of the entire ecosystem. Some species are already responding to a warmer climate by moving to cooler locations. For example, some North American animals and plants are moving farther north or to higher elevations to find suitable places to live. Climate change also alters the life cycles of plants and animals. For example, as temperatures get warmer, many plants are starting to grow and bloom earlier in the spring and survive longer into the fall. Some animals are waking from hibernation sooner or migrating at different times, too.
Explanation:
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Why can't calico cats reproduce?
Answer:
How do calicos reproduce? Due to their unique genetic makeup (and the fact that male calico cats are born sterile), calico cats cannot actually be bred. Rather, nature produces these colorful kitties randomly.
Explanation:
What are the 3 factors of natural selection?
The core of Darwin's thesis is that if three criteria are met, natural selection will take place. Factors: The battle for existence, variety, and inheritance is represented by the circumstances highlighted in bold above.
Most attributes are inherited, more offspring are generated than can survive, and offspring with more attractive traits will survive and have more offspring than those with less favorable traits. These three principles result in natural selection, which is an unavoidable process.
More environment-adapted organisms are more likely to survive and pass on the genes that contributed to their success. Over time, species change and diverge as a result of this process. One method of accounting is natural selection.
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54. Using mechanical friction when prepping will not aid in: a. Removal of resident bacteria b. Removal of dirt and oil c. The effectiveness of antimicrobials d. Removal of transient bacteria
Using mechanical friction when prepping will not aid in: a. Removal of resident bacteria.
Friction is described because the resistance to movement because of sliding, and all equipment devour frictional strength due to the fact their components slide in opposition to one another. Lubrication can manipulate friction in a number of those times however very often, including in engines, maximum mechanical strength is misplaced through shearing liquid lubricant films. In mechanical structures including inner combustion engines, the time period refers back to the electricity misplaced in overcoming the friction among transferring surfaces. Frictional forces, such as the traction needed to walk without slipping, may be beneficial, but they also present a great measure of opposition to motion.
Thus, option a is the correct choice.
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what is an inex fossil
Answer:
Explanation:
An index fossil is used for learning the age of geological periods.
What keeps the temperatures on the Pacific Coast relatively moderate year-round?
A. the clouds hanging over the coast
B. the direct sunlight received all year
C. the large population of California
D. the ocean currents
Answer:
Ocean Currents
Explanation:
if anyone could complete this timeline in order, left to right, that'd be much appreciated :)
Explanation:
if anyone could complete this timeline in order, left to right, that'd be much appreciated :)
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What is the role of carbon dioxide exchange with the ocean?
The role of carbon dioxide exchange with the ocean is A lot of the carbon dioxide that is released when fossil fuels are burned is taken up by the ocean.
Ocean acidification is the process by which this additional carbon dioxide is lowering the pH of the ocean.
The carbon cycle is significantly influenced by human activities. Changes in land use, the burning of fossil fuels, and the use of limestone in concrete all contribute significantly to the emission of carbon into the atmosphere. Marine organisms, such as corals, Dungeness crabs, and snails, are unable to construct their shells and skeletons due to ocean acidification.
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Which fundamental principle surrounding enzymes explains why transition state analogues are able to act as potent inhibitors of naturally occurring enzymes
A fundamental principle surrounding enzymes is that they can only catalyze reactions if the substrate binds to a specific site on the enzyme. This site is known as the active site.
The active site of an enzyme is a highly specific region that contains amino acid residues that interact with the substrate. These residues form a complementary shape that is specifically tailored to bind to the substrate. This binding of the substrate to the active site is what allows the enzyme to catalyze the reaction.
The transition state of a reaction is the energy state of the molecules just before the products of the reaction are formed. Transition state analogues are molecules that are designed to mimic this transition state and can be used to inhibit the enzyme.
Due to their similarity to the transition state of the reaction, the transition state analogues bind to the active site of the enzyme. This binding is strong and tight, preventing the natural substrate from binding. Therefore, the enzyme is unable to catalyze the reaction and is inhibited.
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All fungi are considered Group of answer choices auto/heterotrophs, cell wall made of peptidoglycan, prokaryotic heterotrophs, to have cell walls made of chitin, eukaryotic autotrophs/heterotrophs, cell wall made of psuedomurien, prokaryotic autotrophs, cell wall made of cellulose, eukaryotic
Answer:
to have cell walls made of chitineukaryotic heterotrophsExplanation:
Domains are the highest taxonomic category in which living beings can be grouped or divided. There are three domains: archaea, bacteria, and eukarya.
The eukarya domain is composed of the Protist, Fungi, Plantae, and Animalia kingdoms.
Kingdoms include different phyla closely related.
The Fungi kingdom includes yeasts, molds, and mushrooms. All of them are characterized by the same general aspects.
All the members of the kingdom
Lack mobility, growing on the ground, organic matter, or other surfaces. They all have a rigid cell wall composed of chitin. They grow like hyphae, which are cylindrical uniformed structures that might reach many centimeters in length. Heterotrophic nutrition. The species can not produce their own food, so they decompose organic matter and get the nutrients from there. Reproduction is by spores, which are resistant to adverse environmental conditions.How do limiting factors change the carrying capacity?
7th grade
What was the main aim of Mendel's experiment?
The main aim of Mendel's experiment was to understand the principles of inheritance of genetic traits in pea plants.
He performed a series of controlled crossbreeding experiments, where he carefully selected and crossbred pea plants that exhibited specific traits, such as seed color (yellow or green) and seed shape (round or wrinkled). He then recorded the characteristics of the resulting offspring and compared them to the characteristics of the parent plants. Through these experiments, Mendel discovered that certain traits were inherited in a predictable pattern, and that these patterns could be explained by the presence of genes that controlled the inheritance of each trait. He also discovered that these factors could be dominant or recessive, and that the combination of these factors determined the phenotype (observable characteristics) of the organism. These discoveries formed the basis of Mendel's laws of inheritance, which are considered to be the foundation of the field of genetics.
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how many body openings do comb jellyfish have A 0 B 1 C 2 D3
Answer:
C 2
Explanation:
They have two (2) holes. While true jellies have a sealed bell with only one opening (like the one opening of an anemone), comb jellies have a small opening at the top of their body and one at the bottom so that water can flow through them. - They often have plates for protection on the outside of their bodies.
ayuda porfavor es para hoy :(
Answer:
B
Explanation:
si mi pensamiento es correcto, sería B. porque tienes las masas de las moléculas y esas se quedan con el símbolo periódico para ellas.
arrange the constititual ideas in the order in which they appear in the U.S Constituation
Answer:
The Constitution is divided into seven articles on different topics. Each article is further divided into sections
Explanation:
Article I deals with the legislative branch of government
Article II concerns the executive branch of government
Article III establishes the Supreme Court as the highest judicial power in the United States
Article IV defines the relationship between the states
Article V describes the procedure for amending the Constitution
Article VI declares itself, the Constitution, as "the supreme Law of the Land"
Article VII ratifies the Constitution
When a skydiver jumps out of an airplane, there are two forces acting on
her: gravity and air resistance. After falling for a few seconds the forces
due to gravity and air resistance balance each other. Once the two forces
are balanced, what type of motion will the skydiver have?
Answer:
The skydiver will stop accelerating, and will travel at a constant speed in one constant direction.