Gdz Biologiia 7 Sumatokhin Klass Dvukhstvorchatye Molliuski Onlain Here

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

: Most bivalves are filter feeders. They draw water into their mantle cavity through a siphon, where specialized gills trap organic particles. Internal Systems Pasechnik, these organisms are studied for their unique

: Many species, such as scallops and oysters, are significant food sources for humans. Freshwater pearl mussels are also cultivated for pearl production. Internal Systems : Many species, such as scallops

: Students typically study the Anodonta (swan mussel), Unio (painter's mussel), and marine species like the edible mussel and giant clam. : The nervous system is simplified

: The nervous system is simplified, consisting of three pairs of ganglia. Ecological and Economic Importance