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38: Ellen Weatherford, Can Fish Drown, and Real Pokemon

Let's Learn Everything!

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The Evolution of Fish Gills

Fish evolved gill-like structures that they started to adapt into specializing in gas exchange. They used these gill organs not just for filtering out nutrients, but actually for absorbing the dissolved oxygen from the water around them. So those are full of blood vessels. If you've ever looked inside of a fish's gills I have not. All the time.

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