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

Example Input: Chewing insects such as dragonflies and grasshoppers have two many sets of jaws.
Example Output: Chewing insects such as dragonflies and grasshoppers have how many sets of jaws?

Example Input: If an air mass forms over an ocean it is called a maritime air mass.
Example Output: If an air mass forms over an ocean it is called what type of air mass?

Example Input: Arachnids have 4 pairs of legs.
Example Output:
How many pairs of legs do arachnids have?