with gills; they're fish!
Class Agnatha
through holes in there body. who knows what ones... probably all of them....
they have seven gills made of cartilage which are attached onto modified lungs
jawless fishes
Jawless fish are the oldest group of fish, belonging to the class Agnatha. Within this class, they are further divided into two orders: the Petromyzontiformes (lampreys) and the Myxiniformes (hagfish).
Fishes of class AGNATHA (myxini) have tooth-like structures that are composed of KERATIN..
Agnatha means 'no jaws', and they really don't have jaws, although they do have teeth. They also have no stomach, and no boney skeleton. Their skeleton is cartilagineous, like the elasmobranchs.
Class Agnatha (jawless fish)Class Chondrichthyes (cartilaginous fishes)Class Osteichthyes (bony fishes)Class Amphibia (amphibians)Class Reptilia (reptiles)Class Aves (birds)Class Mammalia (mammals)
how do birds breathe
In Phylum Chordata, jawless fish are grouped within Superclass Agnatha. Examples of jawless fish include lampreys and hagfish, which combined total about 120 different species.
No, trout are not jawless fish. They belong to the class Osteichthyes, which includes jawed fish with bony skeletons. Jawless fish belong to the class Agnatha, which includes animals like lampreys and hagfish.
Lampreys are in the superclass Agnatha, jawless fish. They are of the class Cyclostomata, which includes hagfish, as opposed to the extinct Ostracoderms.