sentences: the brain is a part of the body & the spinal cord is a part of a body ->  the brain and the spinal cord are parts of the body  the brain and the spinal cord are parts of the body & nerves are a part of the body ->  the brain and the spinal cord and the nerves are parts of the body  the brain and the spinal cord and the nerves are parts of the body & the brain, spinal cord, and nerves work together ->  the brain and the spinal cord and nerves are parts of the body that work together  the brain and the spinal cord and nerves are parts of the body that work together & an organ system is made of different parts of the body working together ->  the brain and the spinal cord and the nerves make up an organ system  the brain and the spinal cord and the nerves make up an organ system & if things make up something, then those things combine to form that something -> the brain and the spinal cord and the nerves combine to form an organ system