Gdz Biologiia 7 Sumatokhin Klass Dvukhstvorchatye Molliuski Onlain -

: They breathe through plate-like gills (ctenidia) located in the mantle cavity.

: Many species, such as scallops and oysters, are significant food sources for humans. Freshwater pearl mussels are also cultivated for pearl production. : They breathe through plate-like gills (ctenidia) located

: They possess an open circulatory system with a heart and vessels. such as scallops and oysters

The Class Bivalvia (Двустворчатые моллюски) is a group of aquatic mollusks characterized by a shell composed of two hinged parts. In the 7th-grade biology curriculum by S.V. Sumatokhin and V.V. Pasechnik, these organisms are studied for their unique evolutionary adaptations to a sedentary lifestyle. Key Biological Features : They breathe through plate-like gills (ctenidia) located