What is the CNO cycle?
A) the process by which helium is fused into carbon,nitrogen,and oxygen
B) the process by which carbon is fused into nitrogen and oxygen
C) a type of hydrogen fusion that uses carbon,nitrogen,and oxygen atoms as catalysts
D) the period of a massive star's life when carbon,nitrogen,and oxygen are fusing in different shells outside the core
E) the period of a low-mass star's life when it can no longer fuse carbon,nitrogen,and oxygen in its core
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