The correct answer is: A. Nondisjunction
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Plant cell have cell wall while animal cell do not.
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It would be D. being able to eat plants that survive in the changed environment
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Quick Answer. Collagen is the protein that all animals have in common, even single-celled animals and creatures such as sponges that lack differentiated bodies. Collagen is a cable-like protein that can calcify into bone, shell or other hard structures.
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