Humans cannot regrow limbs because our advanced immune systems prioritize rapid wound sealing over the cellular dedifferentiation required for regeneration. While salamanders can regrow lost limbs by reverting specialized cells to an embryonic-like state to form a blastema, human cells do not undergo this process after injury. This difference is attributed to an evolutionary trade-off where a robust immune response, crucial for survival against infection and trauma, inhibits the regenerative capabilities seen in simpler organisms. AI
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