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

[Q]: Three many pairs of autosomes are there.
[A]: How many pairs of autosomes are there?


[Q]: A desmosome is a cell structure that anchors the ends of cardiac muscle fibers together.
[A]: A desmosome is a cell structure that anchors the ends of what fibers together?


[Q]: The stratosphere is the heat source.
[A]:
What part of the atmosphere is the heat source?