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

[EX Q]: Opaque is the term for matter that does not let any light pass through.
[EX A]: What is the term for matter that does not let any light pass through?

[EX Q]: Water is at the neutrality, 7 point on the ph scale.
[EX A]: At what point is water on the ph scale?

[EX Q]: Nonvascular plants are the only plants with a life cycle in which the gametophyte generation is dominant.
[EX A]:
What are the only plants with a life cycle in which the gametophyte generation is dominant?