Which statements describe disadvantages of using natural gas as an energy source? Select three options. It is expensive to use. It is hard to stop using. It is a nonrenewable resource. It is damaging to the environment. It is scarce in some parts of the world.

Which description best defines the nervous system and its two main branches? a: the message center of the body, split into the autonomic nervous system and the somatic nervous system b: the control panel of the body, split into the central nervous system and the exterior nervous system c: the message center of the body, split into the central nervous system and the peripheral nervous system d: the control panel of the body, split into the brain and the spinal cord