There are what who study how animals behave in their natural environment.\nOptions:\n- (A) infants\n- (B) heat or cold\n- (C) insects\n- (D) sensory neurons\n- (E) scientists\n- (F) people\n- (G) humans\n- (H) reptiles Let's solve this problem gradually.

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Ethologists usually study how animals behave in their natural environment. Ethologists are scientists who study animals in their natural habitats. There are scientists who study how animals behave in their natural environment. So the final answer is (E).
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