Morphology of a shark: large, long and very powerful selachian fish. It is viviparous.
Head: foremost part of a shark, comprising the skull and face.
First dorsal fin: front locomotive limb on the back of a shark.
Second dorsal fin: rear locomotive limb on the back of a shark.
Caudal fin: locomotive limb at the end of a shark.
Pelvic fin: locomotive limb beneath the pelvic girdle of a shark.
Belly: lower part of the trunk of a shark.
Pectoral fin: locomotive limb on the chest of a shark.
External gill openings: gill slit.
Mouth: entrance to the digestive tract of a shark.
Eye: sight organ of a shark.