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

Metabolism produces waste energy in the form of heat, which helps warm-blooded (endotherm) animals conserve and maintain heat at a relatively constant body temperature.
Metabolism produces waste energy in the form of heat, which helps what type of animal conserve and maintain heat at a relatively constant body temperature?

Dig a well allows people to access water in an aquifer that does not flow from a spring or a geyser.
How can people access water in an aquifer that does not flow from a spring or a geyser?

Gut is the name of the roundworms digestive organ.
What is the name of the roundworms digestive organ?