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A heart with three chambers,one atrium,and two ventricles is shared by _____.
Fins
External appendages on fishes and some other aquatic animals, used primarily for movement, steering, and balance in water.
Jawless Fish
Primitive vertebrates lacking jaws, such as lampreys and hagfish, forming the class Agnatha.
Cartilaginous Skeletons
Skeletons made of cartilage rather than bone, common in sharks, rays, and other elasmobranch fish.
Jaws
Bony structures in the mouth of vertebrates that are used for biting and chewing food.
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