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

Input: Consider Input: Some gametophytes develop underground and form mycorrhizal associations with fungi.

Output: Some gametophytes develop underground and form mycorrhizal associations with what?

Input: Consider Input: Terrestrial biomes are associated with land, while aquatic ones are associated with water.

Output: Terrestrial biomes are associated with land, while aquatic ones are associated with what?

Input: Consider Input: If a catalyst runs out, the reaction slows.
Output: What happens if a catalyst runs out?