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19 December, 19:32

Hakeem is testing the effects of sunlight on samples of soil. Which of these actions would introduce confounding variables into Hakeem's experiment?

He tests a theory that's already been established.

He tests multiple hypotheses at a time.

He uses identical specimens when completing multiple trials.

He adjusts the independent variable and records the effects.

He uses different types of soil in each of his samples.

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  1. 19 December, 21:12
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