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: an animal requires enough nutrients to maintain good health
What requires nutrients to grow and heal?

Fact: a plant absorbs carbon dioxide from the air for photosynthesis
Trees take in CO2 from the atmosphere for?

Fact: the color of an object can be discovered by looking at that object

which one of these students can accurately determine the color of the board marker?