Why do you need both a skeletal system and Muscular system for movement?

the Skeletal and the Muscular system both work together to help support the and move the body. The Skeletal system of course has bones but to serve and be able to protect the organs, for the body of the weight and the shape of the body. Without these two we wouldn't be bale to move and be able to have our bones and organs inside protected.

Explanation: hopefully this helped :)

answer at the divergent plate boundary in the middle of the ocean;