Fish are aquatic vertebrates without appendages with digits and obtain oxygen through gills. Bony fishes, part of Osteichthyes, are the largest group of vertebrates today.
Fish are aquatic vertebrate animals with gills that lack appendages with digits. They obtain oxygen through gills and come from the phylum Chordata. Bony fishes, belonging to the clade Osteichthyes, form the largest class of vertebrates today.
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