Write down four characters of Osteichtyes and give two examples.
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Osteichthyes
Characteristics:
- body is streamlined with Bobby endoskeleton
- body is covered with cycloid scales
- mouth is terminal
- have 4 pair of gill-slits, covered with an operculum
- air bladder present
- heart is 2 chambered
- sexes are separate
- external fertilisation takes place
eg:Catla, Betta and Labeo
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