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7 September, 14:11

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

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Answers (1)
  1. 7 September, 15:22
    0
    D thats the only answer that is internal
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