instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
The cardiovascular system in the human body consists of the heart, a network of blood vessels, and blood.
answer:
Which system in the human body consists of the heart, a network of blood vessels, and blood?

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:
Neutrons are electrically neutral.
answer:
What part of an atom is electrically neutral?