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That question should probably be more limited, something like, what is the smallest bone in the human body (one of the inner ear bones), or what is the smallest organ (possibly the pineal gland) rather than what is the smallest part, because everything in the universe is ultimately made of the same small parts, which are sub-atomic particles. From the perspective of a physicist, a quark would be the smallest part.

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Sister Little

Lvl 13
3y ago

What else can I help you with?