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Sample Response: 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. What did you include in your response? Check all that apply. The contraction and relaxation of muscle pairs work to move bones. Bones and muscles work together to allow movement. Muscles work in pairs to create movement.

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Answer:

This question is about what you put your response. For example, if you said muscles work in pairs to create movement, you would put that down, and because it is a check all that apply, you could put all of them down if that's really what you included in your response!

Explanation:

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