Convergent evolution: Diverse sea creatures evolved to reach same swimming solution

Moving one's body rapidly through water is a key to existence for many species. The Persian carpet flatworm, the cuttlefish and the black ghost knifefish look nothing like each other -- their last common ancestor lived 550 million years ago, before the Cambrian period -- a new study uses computer simulations, a robotic fish and video footage of real fish to show that all three aquatic creatures have evolved to swim using the same mechanical motion.

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