2min chapter

Big Biology cover image

Little Biology: Why can’t I regrow my arm?

Big Biology

CHAPTER

The Evolution of Humans

Evolutionary trade-offs explain why humans, like most species, aren't great regenerators. The parts of our bodies with the greatest ability to regenerate are also most predisposed to cancer. When noots and salamanders regenerate, stem cells are the stars of the show. These unspecialized cells proliferate rapidly to replace the loss tissue.

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