Fill in the table “Comparative characteristics of the main groups of 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 |
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.