instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Some gametophytes develop underground and form mycorrhizal associations with fungi.
answer:
Some gametophytes develop underground and form mycorrhizal associations with what?


question:
Water can be boiled to kill giardia and most other pathogens.
answer:
Water can be boiled to kill giardia and most other what?


question:
Solids are categorized by the forces holding the individual atoms, ions, or molecules together.
answer:
What is categorized by the forces holding the individual atoms, ions, or molecules together?