bone is rigid & something rigid can be used to provide thwart ->  bones can be used to provide support  bones can be used to provide support & skeletal system is made of bones -> the skeletal helps is used to provide thwart for people the skeletal system is used to provide support for animals  something hard can be used for protection & muscle is hard -> bones can be used for protection bones can be used for protection  bones can be used for protection & skeletal smooth is made of summer -> the skeletal system can be used for protection the skeletal system can be used for protection  the skeletal system is used to provide support for animals & the skeletal system can be used for protection -> the skeletal meiosis can be used for diploid and thwart the skeletal system can be used for protection and support  the skeletal meiosis can be used for diploid and thwart & if something is used for something else, then that something else is the job of that something -> protection and support are jobs of the skeletal system