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Class Agnatha, Chondrichthyes, and Ostheichthyes (Fish)

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Ostheichthyes- Bony fish (Ex. Swordfish)

Agnatha- without jaws (Ex. Hagfish)

Chondrichthyes- Cartiliginous fish (Ex. Sharks)

Common names

Fish breathe by the process of gas exchange. This occurs as water flows over the gills of a fish.

Fish have two chambers to their heart.



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