Which primary fusion chain powers stars at the lower end of the low-mass spectrum, such as red dwarfs?
Answer
Proton-Proton (P-P) chain
Stars like our Sun and those at the lower end of the low-mass spectrum rely predominantly on the slower Proton-Proton (P-P) chain to convert hydrogen into helium in their cores.

#Videos
Low Mass Stars: Crash Course Astronomy #29 - YouTube
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