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

Example Input: Bones are made up of different types of tissue.
Example Output: Bones are made up of different types of what?

Example Input: 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.
Example Output: Which statement best explains why the Sun and the Moon appear to be about the same size in the sky?

Example Input: All carbon atoms have six protons.
Example Output:
All carbon atoms have how many protons?