What structural feature allows low-mass red dwarfs (below $0.35 M_ ext{odot}$) to consume nearly all of their hydrogen fuel?
Answer
They are fully convective, mixing fuel throughout the entire star
Red dwarfs below the $0.35 M_ ext{odot}$ threshold are fully convective, meaning fresh hydrogen from the outer layers is constantly circulated into the core, allowing them to convert almost all of their hydrogen into fuel.
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