The group of organisms that has existed for the greatest length of time is : ( 1 ) Gastropods
GastropodsAccording to fossil records the group of organisms that have existed for the greatest length of time in the options given below is the gastropods . The gastropods have existed for more than 500 million years ago. They are one of the longest existing group of organsims which consist of snail-like invertebrates.
Hence we can conclude that The group of organisms that has existed for the greatest length of time is Gastropods.
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Which of these will MOST likely occur if chemicals from fertilizers run off into lakes and streams?
Which of these will most likely occur if chemicals from fertilizers run off into lakes and streams?
Fish will die from a lack of oxygen.
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If mendel had crossed a true breeding dominant plant with a true breeding recessive plant, in which of the three generations is the recessive trait visible? f1 generation only p generation only f1 generation and f2 generation p generation and f2 generation
After the crossing, the recessive trait is visible in the p generation and f2 generation.
What is genetics?The term genetics has to do with the science of inheritance. It is the study of patterns of inheritance. True breeding organisms are hom-ozygous.
Hence, when a true breeding dominant plant is crossed with a true breeding recessive plant, the recessive trait is visible in the p generation and f2 generation.
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Answer:
it’s D
Explanation:
the P generation (parent generation) and the f2 generation are the ones that have it visible, the f1 generation doesn’t
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Gold is not a compound.
O A. True
O B. False
Answer:
A or True
Explanation:
Gold is not a compound.
Infants have a fixed stroke volume. What does this mean for how infants will control their cardiac output?
Answer:
Infants are able to regulate cardiac output by changing the stroke volume to a greater extent than presumed, at least when cardiac output is influenced by changes in the mean airway pressure.
Explanation:
An individual receives a knife wound to the axillary region. The nerve plexus most likely to be damaged is the.
Answer:
The brachial plexus is most likely to be damaged.
If there were no lynx controlling the snowshoe hare population, what would eventually happen to the population of the snowshoe hares and the grasses that the snowshoe hares eat?
Answer:
The snowshoe hare population would grow and then go down
Explanation:
This is because they will have less or no predators so that contributes to the population growth. Eventually the population will be so big, that there will be less of the grass left for the whole population because it is so big.
Answer: yes
Explanation: uhh cause hare
When the skin comes in contact with an irritant, receptors in the skin send signals to the spinal cord. The signal is then sent to the brain for processing, and the individual begins to scratch the affected area. Which two systems are most likely interacting when a person experiences itching caused by a skin irritant?
When the skin comes in communication with an hassle, receptors in the skin send signs to the spinal cord. The signal is then sent to the brain for proceed, and the individual begins to rub the affected area.
What kinds of touch receptors are found in the skin?The main types of touch receptor are called thermoreceptors, chemical receptors, and mechanical receptors.
Thermoreceptors are like the thermometer notification for your skin receptors, designed to detect changes in the temperature of the outer skin layers.
Thus, When the skin comes in contact with an irritant, receptors in the skin send signs to the spinal cord.
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How many lunar cycles happen each year?
In some parts of the Edwards Plateau ecoregion in Texas, overgrazing from deer and livestock is killing the grasses that live there. How will the the soil in these areas likely be impacted by overgrazing?
A.
Precipitation will soak into the soil more easily.
B.
Deposition will create more soil.
C.
Weathering will make the soil less useful.
D.
Erosion will remove more of the soil
Answer:c
Explanation:
it will kill the animals that eat the grass and them
According to the evolutionary theory of aging, natural selection has not eliminated many harmful conditions and nonadaptive characteristics in older adults because natural selection Multiple choice question.
According to evolutionary theory ,natural selection is linked to reproductive fitness, which is present only in the earlier part of adulthood.
What is evolutionary theory of aging?Evolutionary theory of aging is a theory that state the reason there is increase in mortality with age. As person grow older, less lifetime fertility remains, Therefore, continued survival lead to a reduced. reproductive fitness.
Therefore, According to evolutionary theory ,natural selection is linked to reproductive fitness, which is present only in the earlier part of adulthood.
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The bones from an animal found at an archaeological dig have a C614 activity of 0.10 Bq per gram of carbon. The half-life of C614 is 5730 yr. What is the age of the bones?
C14 is an isotope used in radiocarbon dating techniques to date organic matter remains. The age of these bones is approximately 6890 years.
What is Carbon 14?
Carbon 14, also known as radiocarbon, is a radioactive carbon isotope.
Isotopes are the atoms of the same element -carbon- that vary in neutrons and, hence, in their massic number. They are alternative forms of the same element.
The radioactive C14 nucleus contains 6 protons and 8 neutrons and has a half-life of 5730 years.
The term half-life is a reference. It means that an organism that has been dead for 5730 years has half the C14 amount or concentration than the same organism had when it was alive.
Knowing the half-life of an element is useful to determine the age of the dead matter.
C14 is used in radiocarbon dating techniques or methods to estimate the age of fossils. This is a reliable technique used for dating organic samples that are less than 50,000 years old.
Available data:
The half-life of C14 is 5730 yearsBones activity of 0.10 Bq per gram of carbonTo answer this question we can make use of the following equation
Ln (C14T₁/C14 T₀) = - λ T₁
Where,
C14 T₀ ⇒ Amount of carbon in a living body. We know, by bibliography, that living organism activity is 0.23 Bq per gram of carbon. So, C14 T₀ = 0.23 Bq/gC14T₁ ⇒ Amount of carbon in the dead body. C14T₁ = 0.1 Bq/gλ ⇒ radioactive decay constant = (Ln2)/T₀,₅T₀,₅ ⇒ The half-life of carbon 14 = 5730 yearsT₀ = Time when the organism was aliveT₁ = Age of bonesLet us first calculate the radioactive decay constant.
λ = (Ln2)/T₀,₅
λ = 0.693/5730
λ = 0.0001209
Now, let us calculate the first term in the equation
Ln (C14T₁/C14 T₀) = Ln (0.1/0.23) = Ln 0.4347 = - 0.833
Finally, let us replace the terms, clear the equation, and calculate the value of T₁.
Ln (C14T₁/C14 T₀) = - λ T₁
- 0.833 = - 0.0001209 x T₁
T₁ = - 0.833 / - 0.0001209
T₁ = 6889.99 ≅ 6890 years
The bones are approximately 6890 years.
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What happens after mRNA
leaves the nucleus?
A. It is used to protect the cell membrane.
B. Its sequence is decoded by the Golgi body.
C. Its sequence is decoded by tRNA.
D. It is used to produce ATP in the
mitochondria.
Identify a signal the brain sends out after the nervous system sends the signal that pH has dropped.
In response to a notification of a decrease in blood pH by the nervous system, the brain sends signals to the external intercostal muscles and the diaphragm.
What is blood pH?Blood pH can be defined as a measure of the molar concentration of hydrogen ions that are present in the blood of a living organism, with respect to its acidity, neutrality or alkanlity (basicity).
In response to a notification of a decrease in blood pH by the nervous system, the brain would send signals (impulses) to the external intercostal muscles and the diaphragm through its respiratory center, so as to help the living organism increase its breathing rate and the volume of its lungs during inhalation.
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When taken up by a cell, which of the following molecules binds to a repressor so that the repressor no longer binds to the operator?
A) inducer
B) promoter
C) repressor
D) corepressor
The molecules that bind to a repressor so that the repressor no longer binds to the repressor operator
The repressor no longer binds to the operator?The lac repressor protein binds to the operator and blocks the binding of RNA polymerase to the promoter and transcription of the operon. The promoter is the binding site for RNA polymerase, the enzyme that carries out transcription. The operator is a negative regulatory site to which the lac repressor protein binds.
With this information, we can conclude that the molecules that bind to a repressor so that the repressor no longer binds to the repressor operator.
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Define cancer in terms of the cell cycle. A. cells display contact inhibition B. cell division stops C. cell division occurs repeatedly without control
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Seed formation without fertilization in flowering plants involves the process of
a) Apomixis
b) Somatic hybridization
c) Budding
d) Sporulation
Explanation:
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Seed formation without fertilization in flowering plants involves the process of ---
A) APOMIXIS
What is a control and an experimental group in an experiment? What is the purpose of each?
Answer:
A control group is basically have 2. The control however doesnt get experimented with. It's basically only there so that you can clearly see the reaction. The experimental group is what you're doing the experiments on.
Explanation:
Reverse genetics can be useful for: Question 4 options: Determining the function of a gene Forensic analysis Cloning desirable animals Amplifying gene sequences
The molecular biology technique of reverse genetics can be useful for determining the function of a gene.
What is reverse genetics?Reverse genetics is method use in molecular biology to determine gene function in an organism
The procedure in reverse genetics involves modifying or certain nucleotide sequences in the DNA coding for a functional gene and then observing changes to the phenotype of the organism brought about by the modifications.
Therefore, reverse genetics can be useful for determining the function of a gene.
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Where would you not find a cholinergic nicotinic receptor.
Answer:
You would not find a cholinergic nicotinic receptor on parasympathetic target organs
Explanation:
Which earthquake will cause more damage: an earthquake of magnitude 5 or 7?
Answer:
Magnitude 7 can cause more damage
Use the drop-down menus to identify the role of each organism in the food chain. in alaska, salmon feed on tiny plants called phytoplankton. during late summer, salmon gather in rivers to reproduce. grizzly bears visit these rivers to feed on the large number of salmon. phytoplankton are . both the salmon and the grizzly bears are . grizzly bears are .
The role of each organism in the food chain are
Phytoplankton ---Autotrophs Salmon---- consumersGrizzly bears ----consumersWhat is the food chain?Generally, A food chain is simply defined as a network of creatures in the Environment that passes nutrients and energy from one organism consumes to another.
In conclusion, Naturally, Phytoplankton is a microscopic algae Autotrophs while Salmon and grizzly bears are both endangered species who are both consumers and Grizzly bears are also secondary consumers.
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Answer:
Phytoplankton are autotophs
Both the salmon and the grizzly bears are consumers
Grizzly bears are sedondary consumers
Explanation:
PLEASE HELP WILL GIVE BRANLIEST!
A. all
b. none
c. theee-fourths
d. half
Answer:
D
Explanation:
How does the contractile vacuole in a single-celled organism function to maintain homeostasis?
It pumps water into the cell.
It pumps water out of the cell.
It pumps solutes into the cell.
It pumps solutes out of the cell.
B. It pumps water out of the cell
Hope this helps :))
Answer:
B
Explanation:
B
Based on information from the periodic table, what does this image
represent?
06
Some students investigated the effect of drinking caffeine on reaction time.
They used a drink containing 32. 25 mg of caffeine per 100 cm
This is the method used.
1. Divide the students into four groups, A, B, C and D.
2. Measure and record the reaction time of each student using the ruler-drop test.
3. Students in:
• group A drink 200 cm of water
• group B drink 200 cm of the caffeine drink
• group C drink 400 cm of the caffeine drink
• group D drink 600 cm of the caffeine drink.
4. Repeat step 2 after 15 minutes.
0
6
1
Describe how to do the ruler-drop test.
[3 marks]
Answer:
I would say b let me know if I was wrong sorry
Why is it beneficial to plants that soil particles have negatively-charged surfaces?.
Answer:
Why is it beneficial to plants that soil particles have negatively-charged surfaces? Negatively-charged ions are pushed towards the roots. They attract positively-charged ions and prevent them from being washed deep into the soil.
Explanation:
hope this helps
Reading Focus Question:
Which parts of the biodome
contain carbon?
i'll give you 50 points Homeostatic mechanisms work continuously to maintain stable conditions in the human body. Using the model provided, explain how feedback mechanisms maintain blood sugar levels. Choose ALL Three that apply.
When blood sugar levels are too low, glucose is released from glycogen where it's stored.
This is an example of a negative feedback mechanism because the initial stimulus is reversed.
This is an example of a positive feedback mechanism because the initial stimulus is enhanced.
When blood sugar levels are too high, the pancreas releases insulin to store excess glucose as glycogen.
When blood sugar levels are too high, the pancreas releases insulin to store excess glucose as glucagon.
Answer:
I think it’s these 3 based off my current knowledge and the internet
When blood sugar levels are too low, glucose is released from glycogen where it's stored.
When blood sugar levels are too high, the pancreas releases insulin to store excess glucose as glucagon.
This is an example of a negative feedback mechanism because the initial stimulus is reversed.
Explanation:
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Answer: The Answer is negative feedback because i just got it write on my online SG
Explanation:
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ANSWER ALL THE QUESTIONS FOR BRAINLIEST
How long ago did the common ancestor of all the organisms on this phylogenetic tree exist?
b. Which two lines diverged 30 million years ago?
c. List all modern descendants of the organism that was alive at the point indicated by the asterisk.
According to Model 1, when did the Giant Panda line diverge from the line that led to modern
bears?
According to Model 1, what animal shares the most recent common ancestor with the Brown
Bear?
In a complete sentence, describe what the branch points and lines in a phylogenetic tree
represent.
Which of the two branches from the common ancestor in Model 1 has the most living
descendants?
6. According to the phylogenetic tree in Model 1, the Red Panda is most closely related to which
animal?
7. Which are more closely related, the Giant Panda and the Red Panda or the Giant Panda and the
Polar Bear? Justify your answer using grammatically correct sentences.
The phylogenetic tree shows the evolutionary relationship between bears and pandas
What is a phylogenetic tree?A phylogenetic tree is a diagrmmatic representation of evolutionary relationships in a tree form where branches represent diversification of species.
From the phylogenetic tree shown:
the common ancestor of all the organisms on this phylogenetic tree existed 40 million years ago the two lines diverged 30 million years ago is the raccoons and red panda and the bears and Model 20The spectacled bear, sloth bear and sun bear were alive at the point indicated the Giant Panda line diverged from the line that led to modern bears 20 million years agothe polar bear shares the most recent common ancestor with the BrownBearThe branch points in represents the divergence points and the lines represent timelines The branch having the bears and giant panda has the most livingdescendantsThe red panda is most closely related to the raccoons The giant panda and polar bear are most closely relatedTherefore, the phylogenetic tree shows the evolutionary relationship between bears and pandas.
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Which property refers to how a mineral reflects light? density hardness luster streak
Answer:
Luster is how a mineral reflects light.
Explanation:
Answer:
Luster is correct
Explanation:
Got it right on Edge