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

Input: Consider Input: Diffusion process helps absorptive protists absorb food molecules across their cell membranes.

Output: Which process helps absorptive protists absorb food molecules across their cell membranes?


Input: Consider Input: Monatomic ions form when a single atom gains or loses electrons.

Output: What form when a single atom gains or loses electrons?


Input: Consider Input: Millions of years ago, plants used energy from the sun to form carbon compounds.


Output: Millions of years ago, plants used energy from the sun to form what?