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: omnivores eat plants
Which creature would be safest from predators in its natural underground habitat?

Fact: birds sometimes eat berries
Birds feed their babies by?

Fact: if all members of a species cannot produce offspring then that species will likely become extinct

Which is likely to disappear?