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

Example Input: The values of strangeness assigned to various particles are based on decay systematics.
Example Output: The values of strangeness assigned to various particles are based on what?

Example Input: Compression zones is the opposite of rarefaction zones, where air molecules in waves are loosely packed.
Example Output: What is the opposite of rarefaction zones, where air molecules in waves are loosely packed?

Example Input: Females are not influenced by the male sex hormone testosterone during embryonic development because they lack y chromosome.
Example Output:
Females are not influenced by the male sex hormone testosterone during embryonic development because they lack what?