How does the skeleton and muscular system function?

The bones of the skeletal system protect the body's internal organs, support the weight of the body, and serve as the main storage system for calcium and phosphorus. The muscles of the muscular system keep bones in place; they assist with movement by contracting and pulling on the bones.

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the darker peppered moth species were favored due to the fact that the industrial revolution had made all the nearby trees a darker color instead of white.