Planarians are a group of free-living flatworms. They have a remarkable ability to regenerate an entire worm from just a tiny fragment of the original.
If you cut a flatworm in half, you’ll end up with two worms. The head half grows a tail, and the tail half grows a head. Researchers now say the worms grow heads and brains of different species.
Image: Richard Ling Flatworms! They're flat worms. So they're Flatworms! Proof at last that biology isn't all "deoxyribonucleic acid"...
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