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

Input: Consider Input: Competive exclusion princple explains why two different species cannot occupy the same niche in the same place for very long.

Output: What explains why two different species cannot occupy the same niche in the same place for very long?


Input: Consider Input: Most of the gray matter is on the surface of the brain, surrounding white matter.

Output: Most of the gray matter is on the surface of the brain, surrounding what other type of matter?


Input: Consider Input: The majority of arthropods live on land.
Output: Where do the majority of arthropods live?