Fill in the table “Comparative characteristics of cartilaginous and bony fish”.
| October 30, 2020 | Education
| class name | Name group | Characteristic signs | Representatives |
| Cartilaginous | Shark | Flattened head, powerful teeth, no scales | Tiger shark |
| Stingrays | Flattened body, bottom organisms | Electric Stingray | |
| Bone | Sturgeon | They live in salty sea water, have a slightly flattened head, an elongated nose | Sturgeon, sterlet, beluga |
| Salmon | The body is round, laterally compressed, have large round scales | Salmon, pink salmon, chum salmon | |
| Cod | They have a small head and a light stripe running along the body. | Burbot, pollock, pollock | |
| Kistepery | Large powerful teeth, the fin has a five-membered structure | Coelacanth | |
| Dipnoi | Have both gill and pulmonary respiration | Horntooth |
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