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

[EX Q]: After fertilization, a zygote forms into two cells.
[EX A]: After fertilization, how many cells does a zygote form into?

[EX Q]: When water is heated by magma and makes its way to the surface and creates a(n) geyser.
[EX A]: When water is heated by magma and makes it's way to the surface what is created?

[EX Q]: When your brain senses that your body temperature is increasing, it sends messages to the blood vessels in the skin to increase in diameter.
[EX A]:
When your brain senses that your body temperature is increasing, it sends messages to the blood vessels in the skin to increase in what?