What does the CNO cycle and the hydrogen proton-proton cycle have in common? Choose the best answer to the question
A) They both trigger at the same temperature.
B) They both are ways to fuse hydrogen nuclei to make helium.
C) They are both cycles in star lives.
D) They are both nuclear reactions; the CNO cycle makes carbon, nitrogen, and oxygen, and the proton cycle makes helium.
B
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