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

[EX Q]: Most hormones are produced by the endocrine system.
[EX A]: Most hormones are produced by which human organ system?

[EX Q]: Particle accelerators can nuclear fusion in stars be simulated.
[EX A]: How can nuclear fusion in stars be simulated?

[EX Q]: We call the recycling of inorganic matter between living organisms and their environment biogeochemical cycle.
[EX A]:
What do we call the recycling of inorganic matter between living organisms and their environment?