Answer:
It is one of two known sets of nuclear fusion reactions by which stars convert hydrogen to helium.
Explanation:
The order of elements by volume-fraction (which is approximately molecular mole-fraction) in the atmosphere is nitrogen (78.1%), oxygen (20.9%), argon (0.96%), followed by (in uncertain order) carbon and hydrogen Explanation: google.
Marie curie, Gregory Mendel, Edward Jenner,Clara Barton
