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

[Q]: You call elements that contain only atoms of one type of element native elements.
[A]: What do you call elements that contain only atoms of one type of element?

[Q]: Antibodies recognize and combine with harmful materials, including both toxic chemicals and invasive microorganisms.
[A]: Which proteins recognize and combine with harmful materials, including both toxic chemicals and invasive microorganisms?

[Q]: A phospholipid is a bond between the glycerol component of a lipid and phosphorous molecule else.
[A]:
A phospholipid is a bond between the glycerol component of a lipid and what else?