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The Science That Discusses Fish is Called Ichthyology Review:
For fish in Greek says Ichthys. The science that discusses fish is called ichthyology. He spends his whole life in the water. Some live in freshwater, and some in salt water. And a number live in both. And all the fish breathe through the branches. (Dipnoi Dipnoi is found in the six and Epicortus in Australia. The six and the branches have a target). His skins are covered by Petro, Felson. His body is divided into 3 categories: head, waist (body), and buttocks. His heart has two cavities (one atrium and the other ventricle). The fish lay eggs. And some of its chicks.
Types of fish: Biologists have divided fish into three (3) categories in terms of construction.
1. Round mouth (Cyclostoma) or fish (Agnatha)
2. Bony fish
3. Cartilaginous fish
Round-mouthed fish: O animals, it has a cylindrical body and a thin and wide tail. Their skin is soft and smooth. Signs and motor muscles are not seen. Notochord stays for the rest of its life, its mouth is tasty. Makes breathing through (14-5) junctions. Her impotence is out. His bilges are (Lamprey) and (Hygfish).