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

Input: Consider Input: Sporopollenin protects the pollen of seed plants and spores of seedless plants.

Output: What protects the pollen of seed plants and spores of seedless plants?


Input: Consider Input: A hookworm is classified as a parasite.

Output: A hookworm is classified as what type of organism?


Input: Consider Input: Mechanical waves can only trave through matter.


Output: Mechanical waves can only trave through what?