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Biology, 01.08.2019 10:00 lsrgb

To raise an arm upward, the muscle on one side of it contracts. what happens to the muscle on the opposite side of the arm? a. contracts b. relaxes c. both contracts and relaxes d. neither contracts nor relaxes

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To raise an arm upward, the muscle on one side of it contracts. what happens to the muscle on the op...

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