Which of the following is an example of a response to an internal stimulus?
a.
an animal responds to a ringing bell.
b.
a person vomits after eating spoiled food.
c.
a person pulls her hand away from a hot surface.
d.
an animal jumps when it hears a sudden, loud noise.
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The answer would be B) A person vomits after eating spoiled food

Explanation: Since the question is talking about internal stimulus think about what happens inside someone, the other options are examples of External stimulus which happens outside someone like using your external senses (hearing, sight and touch)

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a- all cells come from pre-existing cells