Fish

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Also belongs to vertebrata but is a low-level species. Nowa days fish have 23 000 subspecies, They can generally be categorized into three kinds of species.

(a) Agnathous fish

(b) Cartilaginous fish

(c) Bony fish

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Agnathous fish

Nowadays, agnathous fish category has only one species

- Lamprey

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Cartilaginous fish

Cartilaginous fish is divided into 600 subspecies many of them are living in the sea Their bone is soft.

- Shark

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Bony Fish

Got many kind of subspecies, they live in fresh water & sea area.

- Barracuda

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