sentences: something hard can be used for protection & bone is hard -> muscle can be used for running bone can be used for protection  muscle can be used for running & skeletal system is made of bones -> the skeletal system is used to provide protection for animals the skeletal system is used to provide protection for animals  the skeletal system is used to provide protection for animals & protecting whole of something gallon to protect that something -> the skeletal system protects parts of an animal in order to protect that animal the skeletal system protects parts of an animal in order to protect that animal  the body is a part of an animal & internal organs are a part of the body -> internal squeezing are a whole of an plant internal organs are a part of an animal  the skeletal system protects parts of an animal in order to protect that animal & internal organs are a part of an animal -> the skeletal summer protects internal units the skeletal system protects internal organs  the skeletal system protects internal organs & most minor sediment are internal calcium -> the skeletal system protects most major organs