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

Example Input: Some viruses carry a few viral enzyme molecules within their capsids.
Example Output: Some viruses carry a few viral enzyme molecules within their what?

Example Input: The majority of arthropods live on land.
Example Output: Where do the majority of arthropods live?

Example Input: The mantle layer of earth is located just below the crust.
Example Output:
What layer of Earth is located just below the crust?