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

Ex Input:
Single-celled organisms and multicellular organisms have this in common: both have a way to get rid of waste materials.

Ex Output:
Which characteristic do single-celled organisms and multicellular organisms have in common?


Ex Input:
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

Ex Output:
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?


Ex Input:
The combustion of propane gas produces carbon dioxide and water vapor.

Ex Output:
The combustion of propane gas produces carbon dioxide and what else?