D. Asteroids vary greatly in size and are mostly made up stone, iron and nickel
The nervous system consists of things like the spinal cord, brain, and all the nerves that connect the sensory organs. Basically, the nervous system helps different parts of the body communicate with each other; thus leading to control of the body.
The first answer is volcanoes
The second answer is They move because of convection currents in the mantle
Dihybrid Crosses is your answer