There is only one main element involved in the fusion reactions inside the sun; Hydrogen, but if you need a second element then it is more than likely that the question is asking for the isotope of hydrogen that is called <span>deuterium.
So basically, Hydrogen and Deuterium; an isotope of hydrogen</span>
Answer:
Burning fossil fuels, over harvesting of petroleum.
Explanation:
If you cold attach the answers, I can give you a better answer.
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