Question

which option is not a response to internal stimuli?

breathing hard when exercising because of a drop in oxygen levels

wearing sunglasses to protect eyes from uv rays

eating when hungry

drinking when thirsty

Explanation:

Internal stimuli come from inside the body, while external stimuli come from the environment. Breathing hard from low oxygen, eating when hungry, and drinking when thirsty all respond to internal body signals. Wearing sunglasses responds to external UV rays from the sun.

Answer:

B. wearing sunglasses to protect eyes from UV rays