Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

[EX Q]: Renewable energy sources emit fewer or no greenhouse gases.
[EX A]: What type energy sources emit fewer or no greenhouse gases?

[EX Q]: Ionic compounds contain cations and anions rather than discrete neutral molecules.
[EX A]: Ionic compounds contain cations and anions rather than what?

[EX Q]: Children can inherit brown eyes from their parents.
[EX A]:
Which trait can children inherit from their parents?