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

[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]: Deep currents are caused by differences in density at the top and bottom of the ocean.
[EX A]: What is caused by differences in density at the top and bottom of the ocean?

[EX Q]: Only about one percent of plants have lost photosynthesis ability, turning them into consumers and even predators, instead of producers.
[EX A]:
Only about one percent of plants have lost what ability, turning them into consumers and even predators, instead of producers?