TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Compounds with metals and nonmetals sharing electrons are known as ions kinds of compounds.

SOLUTION: Compounds with metals and nonmetals sharing electrons are known as what kinds of compounds?

PROBLEM: In the lungs, oxygen diffuses out of the alveoli and into capillaries.

SOLUTION: In the lungs, oxygen diffuses out of the alveoli and into where?

PROBLEM: Ethical considerdations prohibits knocking out genes.

SOLUTION:
What prohibits knocking out genes?