Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Solid is characterized by molecules with minimal movement and strong forces between them.
Which state of matter is characterized by molecules with minimal movement and strong forces between them?

Population is an important level of organization in ecology and the unit of microevolution.
What is an important level of organization in ecology and the unit of microevolution?

The sun and the moon appear to be about the same size in the sky because the moon is smaller in diameter and is closer to earth than the sun.
Which statement best explains why the Sun and the Moon appear to be about the same size in the sky?