Answer:
B. Whale!
Explanation:
Snail, crawfish, and lily's all live in freshwater.
While D makes no sense water doesn't live anywhere.
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Hcg secreted by placenta not the fastest method to detect pregnancy nor it is specific
Answer: A. Environmental drivers plus genetic variation in the population result in natural selection
Explanation: over geological time environmental conditions change. Organisms do not survive in one environmental niche with traits adapted to a possible future change that might suit those traits. Adaptation is not a matter of choice: adapt if possible or go extinct.
There is a (badly named) concept called pre-adaptation, which is that variations in some existing trait render adaptation to a different environment more likely.
Hippocampal neurogenesis<span> is impacted by environmental factors such as age, excercise, stress and anti-depressant use.</span>
