What is the correct order of processes in the accretion of planetesimals?

Accretion begins when atoms and molecules stick to tiny dust grains. As these grains grow, they gather into larger masses of matter, which then collide and combine to form planetesimals. Therefore, the correct order is “Atoms and molecules are added to dust grain, masses of matter form around dust grain, and masses of matter collide.”

AI-written and checked against the verified answer.