Fill in the table “The main fish organs and their belonging to a particular organ system” and draw a conclusion

Body name The name of the organ system to which it belongs
Gills Respiratory
Stomach Digestive
Intestines Digestive
Liver Digestive
A heart Circulatory
Testes or ovaries Sexual
Kidney Excretory

Conclusion: fish are developed animals that have a spine formed at the site of the notochord. The fish have well-developed respiratory, circulatory, excretory and reproductive systems.

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.