TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: The bird ancestor that lived in trees developed wings, which is commonly associated with birds.

SOLUTION: The bird ancestor that lived in trees developed what feature commonly associated with birds?

PROBLEM: Lichens are not a single organism, but rather an example of a mutualism.

SOLUTION: Lichens are not a single organism, but rather an example of a what?

PROBLEM: Radiation does every star emit that humans cannot see.

SOLUTION:
What does every star emit that humans cannot see?