How do muscles work in the human body? 2 Reasons with examples.

Mucles work via two ways, Contraction and relaxation. Example, contracting your bicep and relaxing your tricep bends your arm. They work this way by connecting to bones, and when they contract or relax it pulls the bone with it. Example, contracting your quads pulls the bone on one side and tightens it against your joint, straightening it like pulling a rubber band tight makes it go straight

Explanation:

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d. planting trees

the trees take in carbon to make oxygen.