“Fish” may not be the best example, given that “fish” is a paraphyletic group (it doesn’t form a clade). (Cladistics is why “birds are dinosaurs” is a usefully true statement.)
“Fish” may not be the best example, given that “fish” is a paraphyletic group (it doesn’t form a clade). (Cladistics is why “birds are dinosaurs” is a usefully true statement.)