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; /// i believe that one of the causes is (a loss of habitat);

because the two particles have an equal charge, the charges will cancel out and give the atom an overall charge of 0. so, if at atom has 35 protons in the nucleus, we could expect it to have 35 electrons orbiting that nucleus.