instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Reptiles are described by the term ectothermic, which means their internal temperature depends on the temperature of their environment.
answer:
Reptiles are described by what term that means their internal temperature depends on the temperature of their environment?


question:
Although they differ vastly in hardness, pencil lead and diamonds both contain carbon.
answer:
Although they differ vastly in hardness, pencil lead and diamonds both contain what element?


question:
Six many neutrons do 99% of carbon atoms have.
answer:

How many neutrons do 99% of carbon atoms have?