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Which is an example of an internal stimulus? A. an increase in the amount of water available to a plant B. a decrease in oxygen levels in the blood during exercise C. a sudden change of air temperature D. an artificial light that attracts insects

User Yassir
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Answer:

i took the k12 test he is right!

Step-by-step explanation:

User Dachmt
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a decrease in oxygen levels in the blood during exercise
User James Tang
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