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

[EX Q]: Temperature and ph level are important in the activity of an enzyme.
[EX A]: Temperature and what other environmental factor are important in the activity of an enzyme?

[EX Q]: Renewable energy sources emit fewer or no greenhouse gases.
[EX A]: What type energy sources emit fewer or no greenhouse gases?

[EX Q]: When scientists work in natural settings rather than a lab, it is called fieldwork.
[EX A]:
When scientists work in natural settings rather than a lab, it is called what?