The reaction to a stimulus.

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Multiple Choice

The reaction to a stimulus.

Explanation:
When something in the environment prompts a change in an organism, that change is the response. The stimulus is the trigger that starts the process, and the reaction that follows is called the response. For example, a hot object is a stimulus, and pulling the hand away is the response. Digestion is a separate metabolic process, and nutrients are substances obtained from food, not the reaction to a stimulus. So the reaction to a stimulus is the response.

When something in the environment prompts a change in an organism, that change is the response. The stimulus is the trigger that starts the process, and the reaction that follows is called the response. For example, a hot object is a stimulus, and pulling the hand away is the response. Digestion is a separate metabolic process, and nutrients are substances obtained from food, not the reaction to a stimulus. So the reaction to a stimulus is the response.

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