The answer is A) food web. B is not actually a thing, and C and D are very different vocab words.
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Answer: D. a genetic bottleneck
Explanation:
A genetic bottleneck also known as a population bottleneck is one that describes a sharp reduction in the size of a population caused by environmental events like in the above or caused by human activities.
I believe the answer you are looking for is they are all body systems found in the human body, or organ systems.
The answer is CrossBreeding
