a windmill collects energy from the wind
A. Cerebellum
By far the largest region of your brain is the forebrain (derived from the developmental prosencephalon), which contains the entire cerebrum and several structures directly nestled within it - the thalamus, hypothalamus, the pineal gland and the limbic system.
It would eventually lead to overpopulation
DNA is the correct answer.
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I believe the answer is Management, hope this helps :)