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please help!!! Which of the following describes a response to external stimuli ?

a. A boy sneezes when exposed to a cat dander.

b. A girl eats food when she is hungry.

c. A child becomes hyperactive do to a chemical imbalance.

d. A person yawns when oxygen levels in the blood are low.

Respuesta :

Answer: Saliva, sweat, pee, and dander (dead skin cells) can all trigger allergies. Pet fur also traps mold, pollen, and other outdoor allergens that make you sneeze and your eyes water.

Explanation:

Answer:

A

Explanation:

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