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

Ex Input:
Photoautotrophs and chemoautotrophs are two basic types of autotrophs.

Ex Output:
Photoautotrophs and chemoautotrophs are two basic types of what?


Ex Input:
After fertilization, a zygote forms into two cells.

Ex Output:
After fertilization, how many cells does a zygote form into?


Ex Input:
A single-celled prokaryotic is a bacteria.

Ex Output:
What type of organism is a bacteria?