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serious [3.7K]
3 years ago
13

Which is an example of an internal stimulus?

Biology
2 answers:
8_murik_8 [283]3 years ago
5 0

Answer:

D. A decrease in oxygen levels in the blood during exercise.

Explanation:

Trus me

Rama09 [41]3 years ago
4 0
D thats the only answer that is internal
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