Given a fact, create a question that can be answered using the fact. Construct the question such that it is unambiguous, has a unique answer and the answer can be given using the fact.

Fact: plant reproduction requires pollination
Pollination is required for what reproduction?

Fact: as light pollution increases , seeing the stars will be harder
A quiet desert town will see more _____ than a big city will.?

Fact: a cactus stem is used for storing water

Someone stranded in the Sahara can potentially save their life with a?