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:
Read the Quran. it tells you how did it begin
The both decrease genetic variation
Epinephrine HCL is considered as bronchodilator.