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

Example Input: Microscopes were first developed in the early 1600s by eyeglass makers.
Example Output: Microscopes were first developed in the early 1600s by this trade?

Example Input: The cells in the follicle undergo physical changes and produce a structure called a corpus luteum.
Example Output: The cells in the follicle undergo physical changes and produce a structure called a what?

Example Input: Iridescent green beetles, known as jewel beetles, change color because of the light-reflecting properties of the cells that make up this?
Example Output:
Iridescent green beetles, known as jewel beetles, change color because of the light-reflecting properties of the cells that make up this?