I think it is b
<span>Amphibia, Reptilia, Aves, and Mammalia</span>
Humans internal body temperature is a great example of homeotosis.
Agricultural chemicals is an example of a nonpit source of freshwater pollution
The most likely answer is A) A drastic reduction in the animal population due to migration or death by starvation.
Answer:
The independent variable is "controlled" or held constant in the control group. A single experiment may include multiple experimental groups, which may all be compared against the control group. The purpose of having a control is to rule out other factors which may influence the results of an experiment.
Explanation: