Question

which evidence is most likely used to indicate the beginning of solar system formation?
materials combined to form a mass.
materials were pulled together by gravity.
water condensed and collected to form oceans.
different species of microorganisms lived on earth.

Explanation:

The solar - system formation is thought to have begun with the gravitational collapse of a giant molecular cloud. Materials being pulled together by gravity is a key early - stage process in solar - system formation. The formation of a mass from combined materials is a later stage. The formation of oceans and the presence of microorganisms on Earth are events that occurred long after the start of solar - system formation.

Answer:

Materials were pulled together by gravity.