instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Ectothermic vertebrates control body temperature to just a limited extent from the outside by changing behavior.
answer:
What type of vertebrates control body temperature to just a limited extent from the outside by changing behavior?


question:
While the numerical aperture can be used to compare resolutions of various objectives, it does not indicate how far the lens could be from the specimen.
answer:
While the numerical aperture can be used to compare resolutions of various objectives, it does not indicate how far the lens could be from the what?


question:
Geothermal energy energy is clean and does not release greenhouse gases.
answer:

What type of energy is clean and does not release greenhouse gases?