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

[EX Q]: Bacteria is usually the prey of a protist.
[EX A]: What is usually the prey of a protist?

[EX Q]: Rainfall weather phenomenon increases the rate of weathering in rock and soil.
[EX A]: What weather phenomenon increases the rate of weathering in rock and soil?

[EX Q]: The four closest planets are more dense of the following statements best describes how the four planets closest to the sun are different from the next four planets in our solar system.
[EX A]:
Which of the following statements best describes how the four planets closest to the Sun are different from the next four planets in our solar system?