You duck your head when a baseball is thrown at your face. You are responding to:

An external stimulus

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An internal stimulus

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An internal threat

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A hormonal change

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Solution

The correct option is A
An external stimulus

An external stimulus is a change in the surroundings that causes the body to respond. In this case, you duck your head because the ball is thrown at your face. The ball acts as a source of external stimulus and ducking of face is the response for it.

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You duck your head when a baseball is thrown at your face. You are responding to:

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