History
History, 26.07.2019 02:30, sierralynnbaldp16d4b

Why do skeletal muscles work in pairs? a. one tightens and the other relaxes to make the bones move. b. multiple muscles have to tighten to make joints move. c. they cancel each other out. d. bones are resistant to movement.

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Why do skeletal muscles work in pairs? a. one tightens and the other relaxes to make the bones mov...

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