In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

[Q]: Question: What is a byproduct from the combustion of fossil fuels like coal and gasoline? Answer: nitrogen dioxide
[A]: Nitrogen dioxide is a byproduct from the combustion of fossil fuels like coal and gasoline.


[Q]: Question: What is the most abundant element in the universe? Answer: hydrogen
[A]: Hydrogen is the most abundant element in the universe.


[Q]: Question: The earth's magnetic poles have done what repeatedly in the past? Answer: switched places
[A]:
The earth's magnetic poles have switched places repeatedly in the past.