Question

which statement accurately describes planetesimals?
○ they are the origins of planets.
○ they formed from ice and rocks.
○ they were created during the big bang.
○ they contain 98% of matter in the solar system.

Explanation:

Planetesimals are small celestial bodies that form from the accumulation of dust, ice, and rock in a protoplanetary disk. Through collisions and accretion, they merge to form planets, making them the building blocks (origins) of planets. The other options are incorrect: they form from more than just ice and rocks (including dust), they formed long after the Big Bang, and the Sun contains over 98% of the solar system's matter, not planetesimals.

Answer:

A. They are the origins of planets.