Biology, 03.01.2020 06:31, ASTROBOY1

An experimenter wanted to test the effects of cigarette smoking on rats. she infused the cages of 50 rats with cigarette smoke and the cages of another 50 rats with pure, clean air. the rats that received the clean air were the

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An experimenter wanted to test the effects of cigarette smoking on rats. she infused the cages of 50...

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