Something You Should Know cover image

How, Why and When Doctors Make Mistakes & How Creatures and People Actually Evolve

Something You Should Know

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What's This Doing in Fish?

Lungs came about in the fossil record eons before creatures took their first steps on land. Fish originally evolved lungs to live in water that had variable oxygen content. Same thing is true with appendages, we find fish with arms and legs in fossils. What you're doing is your re purposing, re using, modifying what exists in new ways. And that's the big step.

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