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

Q: Six many neutrons do 99% of carbon atoms have.

A: How many neutrons do 99% of carbon atoms have?
****
Q: Carbon atoms have six neutrons as well as six protons.

A: Carbon atoms have six neutrons as well as how many protons?
****
Q: Wood burning is an example of a different substance being formed.

A:
Which is an example of a different substance being formed?
****