Question

Which is an example of an internal stimulus?

A) a sudden change of air temperature
B) an artificial light that attracts insects
C) an increase in the amount of water available to a plant
D) a decrease in oxygen levels in the blood during exercise

Answer 1

The answer to your question is D, a decrease in oxygen levels in the blood during exercise.

Hope this helps!

Answer 2

A decrease in oxygen levels in the blood during exercise

Step-by-step explanation:

That is the correct answer, I promise I got it correct.

I took the K12 test.