Classified in the phylum of vertebrates. The animals that live in the water. As cold-blooded animals Breathe with gills and a spine Can move with fins and muscles of the body. Some scales covering the whole body. Some have no scales, but covered with slippery slime or bony plates. It has two rooms and a jaw. Except fish species, sharks come from chickens , animals that live in the water of some kind. Was known affectionately as starfish that same fish, dolphins, whales and squid, which is a source of all the animals living in the water all together. But not classified in the same genus with fish. The anatomy and physiology was different drugs. The starfish are invertebrates as well as fish. There is a limestone structure Dolphins and whales are classified as a mammal that can not breathe through lungs and gills. Squid is invertebrate. The animals were included with the same type of shellfish.
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