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

[EX Q]: You see a faster reaction rate when the concentration of reactants is higher.
[EX A]: What kind of reaction do you see when the concentration of reactants is higher?

[EX Q]: The sun and the moon appear to be about the same size in the sky because the moon is smaller in diameter and is closer to earth than the sun.
[EX A]: Which statement best explains why the Sun and the Moon appear to be about the same size in the sky?

[EX Q]: Viruses biological agents that infect living hosts contain dna, yet lack the other parts shared by all cells, including a plasma membrane, cytoplasm, and ribosomes.
[EX A]:
What biological agents that infect living hosts contain dna, yet lack the other parts shared by all cells, including a plasma membrane, cytoplasm, and ribosomes?