Which of the following is a stimulus, which is a response?

a) the recess bell ringing in an elementary school

b) your mouth watering at the sight of food on a plate

c) a sudden drop in air temperature

d) a flu virus entering your body

e) getting "butterflies" in your stomach before a speech

Response-b) your mouth watering at the sight of food on a plate

Stimulus-a) the recess bell ringing in an elementary school

Explanation:

An stimulus is somthing happening that causes a reaction in an individual, for example, when you see the person you like, you get nervous, the stimulus is the sight of the person you like, the response is getting nervous, so from the options a response is your mouth watering at the sight of food on a plate, and an stimulus would be the recess ringing in an elementary school, because that immidiately sets a response form the students to stand from their tables and run outside.

A, c, e are stimuli.

b, d are responses.