Biology, 04.09.2020 02:01 adrianvigil6400

Hakeen is testing the effects of sunlight on samples of soil. Which of these actions would introduce confounding variables into Hakeems experiment? A. He tests a theory that’s already been established.
B. He tests multiple hypothesis at a time.
C. He uses identical specimens when completing multiple trials.
D. He adjusts the independent variable and records the effects.
E. He uses different types of soil in each of his samples.

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