Your friend Chris is interested in studying rats. He usually feeds them seeds, which is their normal diet. Sometimes when they are very good eats, he gives them cheese as a treat. He notices that his best-behaved rats are also very fat. How can he prove that the cheese treats are the cause of this weight gain?
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Organisms that successfully adapt will leave to grownone of the above
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Your friend Chris is interested in studying rats. He usually feeds them seeds, which is their normal...
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