instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
The heterotroph eats only or mainly plants.
answer:
The heterotroph eats only or mainly what?


question:
After fertilization, a zygote forms into two cells.
answer:
After fertilization, how many cells does a zygote form into?


question:
Smell of these senses lets dora know when a skunk has been close to her house.
answer:

Which of these senses lets Dora know when a skunk has been close to her house?