The Moon has no gravity. The Moon does not go around the Sun. The Moon has little water and oxygen. The Moon is much smaller than Earth.
I gave my students this multiple choice question: Which fact best explains why there is life on Earth but not on the Moon?

Only one answer is correct among these 4 choices:
- The Moon has no gravity.
- The Moon does not go around the Sun.
- The Moon has little water and oxygen.
- The Moon is much smaller than Earth.

Could you tell me which one is correct?

The Moon has little water and oxygen.