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

Input: Consider Input: The cardiovascular system in the human body consists of the heart, a network of blood vessels, and blood.

Output: Which system in the human body consists of the heart, a network of blood vessels, and blood?


Input: Consider Input: A collapsing nebula leads to nuclear fusion process.

Output: A collapsing nebula leads to what process?


Input: Consider Input: The unpaired ethmoid bone is located at the midline within the central skull.


Output: The unpaired ethmoid bone is located where within the central skull?