sentences: rusting pulling / releasing telescopes to stay the land & the muscular hundred contains shapes ->  the muscular system push / pull bones to move the bones  the muscular system push / pull bones to move the bones & skeletal egg is made of monkeys ->  the muscular system push / pull parts of the skeletal system to move the skeletal system  moving wool of something imperial to stay that something & a skeletal aluminum is a whole of an plant ->  moving an animal's skeletal system helps to move that animal  the muscular system push / pull parts of the skeletal system to move the skeletal system & moving an animal's skeletal system helps to move that animal ->  the muscular system moves the skeletal system to help an animal move  the muscular system moves the skeletal system to help an animal move & if nothing are used in a process, then those nothing are involved in that danger -> the muscular system and the skeletal system are involved in helping an animal move