1174
What’s in a name?
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Don't be mean. I promise to do my best to judge that fairly.
Because:
Gills.
I'll be just as terse
I admit I don't really know much about that. But Wikipedia says:
Where morphology is:
It sure seems to me like that should cover gills.
Yes, fish would be a morphology that includes gills, fins, streamlined body shape for swimming, etc. But there is no good phylogenetic definition because all the animals we call "fish" do not form a monophyletic group. The monophyletic group encompassing all fish would include also mammals, reptiles including birds, and amphibians because these all have fish ancestors
The challenge was to come up with a group "which includes both trout and sharks but not humans". It seems like "gills" satisfies that pretty well.
Animals with gills do not form a monophyletic group.