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

Example Input: Protists are thought to be the oldest eukaryotes.
Example Output: What is thought to be the oldest eukaryotes?

Example Input: Six many neutrons do 99% of carbon atoms have.
Example Output: How many neutrons do 99% of carbon atoms have?

Example Input: A shallow area of sediment near the shore best describes the part of the ocean called the continental shelf.
Example Output:
Which best describes the part of the ocean called the continental shelf?