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

[EX Q]: Phosphate groups are found within phospholipids and nucleotides.
[EX A]: Phosphate groups are found within phospholipids and what else?

[EX Q]: Evolution occurs by natural selection, a process whereby better-adapted members pass along their traits, according to darwin.
[EX A]: Evolution occurs by what process whereby better-adapted members pass along their traits, according to darwin?

[EX Q]: A(n) chemical bond is a force of attraction between ions and atoms.
[EX A]:
What bond is a force of attraction between ions and atoms?