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 egg requires warmth to develop
Which is more likely to be able to develop?

Fact: living things all require energy for survival
If I wanted to get more energy after exerting myself too much?

Fact: gills are used for breathing water by aquatic animals

Gills allow?