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21 June, 20:38

Valerie hypothesizes that frogs lay more eggs in warm water than in cold water. When Valerie designs her experiment, what should be the only variable that changes?

A.

frog species

B.

time of year

C.

water temperature

D.

water flow rates

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Answers (1)
  1. 21 June, 22:52
    0
    C. Water Temperature
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