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biology /check please

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(stimulus v. response)?
Which of the following is a stimulus, which is a response? Thanks

1)the recess bell ringing in an elementary school
2)your mouth watering at the sight of food on a plate
3)a sudden drop in air temperature
4) a flu virus entering your body
5) getting butterflies" in your stomach before giving a speech

answer :1- stimulus

  • biology /check please -

    Isn't a virus entering your body a stimulus?

    The others are correct.

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