Part 1. Definition
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
Part 2. Example
Earth rotates on its axis once times in one day.
Answer: How many times does Earth rotate on its axis in one day?
Explanation: The given output correctly poses a question based on the scientific fact given.
Part 3. Exercise
Early in the development of a human fetus, the skeleton is made entirely of cartilage.
Answer:
Early in the development of a human fetus, the skeleton is made entirely of what?