Comets are probably made from leftover matter from the formation of a. the solar system. c. the gas giants. b. earth. d. the sun.

ANSWER:

Comets are made from "leftover matter" from the formation of the "Solar System".

EXPLANATION:

Comets are those solid objects from space made up of "ice and dust" which has its own line of revolution to the sun. When these comets come near to the sun, it shows off its long glowing tail. It is not be confused with Asteroids that are similar to them. The Kuiper Belt and the Oort Cloud are the two places in our solar system where comets come from.

Ithink it is space that makes up 70 percent