A scientist wants to test the effect of water temperature on the success of developing frog embryos. The scientist monitors developing
embryos in different water temperatures and counts the number of embryos that mature into tadpoles.
Why should the scientist keep all variables except water temperature constant?
A to test multiple variables at once
B to ensure at least some embryos develop into tadpoles
C to ensure that the results only reflect changing temperature
D to protect the developing embryos
Answers: 3
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A scientist wants to test the effect of water temperature on the success of developing frog embryos....
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