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The food chain would most likely collapse slowing, without a producer other animals cannot get the needed nutrients required to survive.
Answer:
C.) Species
Explanation:
Since you mentioned classifications for animals, the answer would not be families. Genus is a more general classification for animals and groups aren't even part of the classification for animals, so that would leave us with one answer, species.
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A. because the heart will pump more blood filled with oxygen to the muscles that need it most
