Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
--------
Question: Ionic compounds contain cations and anions rather than discrete neutral molecules.

Answer: Ionic compounds contain cations and anions rather than what?


Question: When the phosphorus element - whose name means "light bringing" - was first isolated, scientists noted that it glowed in the dark and burned when exposed to air

Answer: When what element - whose name means "light bringing" - was first isolated, scientists noted that it glowed in the dark and burned when exposed to air?


Question: The cardiovascular system moves nutrients and other substances throughout the body.

Answer:
Which human body system system moves nutrients and other substances throughout the body?