Which statement describes the formation of galaxies? they begin in nebulas. heat and gases contract. gravity causes stars to cluster. dust and gases contract.

Answer;

Gravity causes stars to cluster

Explanation;A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems.  A galaxy is held together by gravity. The galaxy that contains the Earth and its solar system is called the Milky Way.Solar System consists of the stars, the Sun, and its orbiting planets, including the Earth, along with numerous moons, asteroids, comet material, rocks, and dust.

The answer would be sand and gravel