this post was submitted on 04 Apr 2025
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Science Memes

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wizard lizards (mander.xyz)
submitted 1 month ago by [email protected] to c/[email protected]
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[–] [email protected] 4 points 1 month ago (1 children)

Probably not the gills. Once you go lungs you never go back, looking at all those mammals in the ocean.

[–] [email protected] 3 points 1 month ago (1 children)

How do we know none of the fish species never had lungs? Isn't it impossible to define a fish biologically without excluding a whole bunch of land living species?

[–] [email protected] 3 points 1 month ago

We probably can't. It's just lungs are more complex than gills and usually evolution goes towards to more complex systems. If you're talking about classification, I wouldn't say impossible. Though I'm not a taxonomist.