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

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

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A decrease in oxygen levels in the blood during exercise

Explanation:

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

I took the K12 test.

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.