Answer Choices:
◎ Their masses are greater.
◉ They have a thinner atmosphere. Correct!
◎ Both are closer to the sun than Venus.
◎ Their masses are lower.
Step-by-step explanation:
Venus has a very dense atmosphere compared to Mars and Mercury. This causes many small meteorites and asteroids to break apart before they reach the surface. Thus, Venus has fewer craters than Mars and Mercury.