Answer :When the muscle on the top of the arm relaxes and the muscle on the bottom of the arm contracts, the arm straightens. When the muscle on top of the arm contracts and the muscle on the bottom of the bone relaxes, the arm bends. Muscles work in pairs to create movement.
Explanation:
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the answer is golgi apparatus
Answer from: Quest
It is evolution, because we all have some of the same traits like eye color or shape or ears.
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