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

Example Input: When a sperm penetrates the egg, it triggers the egg to complete meiosis.
Example Output: When a sperm penetrates the egg, it triggers the egg to complete what?

Example Input: Ocean ridges formed by marine invertebrates living in warm shallow waters within the photic zone of the ocean are called coral reefs.
Example Output: Ocean ridges formed by marine invertebrates living in warm shallow waters within the photic zone of the ocean are called what?

Example Input: Carbon is the basis of all life on earth.
Example Output:
Which chemical element is the basis of all life on earth?