Gdz Biologiia 7 Sumatokhin Klass Dvukhstvorchatye Molliuski Onlain 【ULTIMATE ◉】

: Unlike gastropods (snails), bivalves lack a distinct head. Their body consists of a torso and a muscular "foot" used for burrowing or anchoring.

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

: Most bivalves are filter feeders. They draw water into their mantle cavity through a siphon, where specialized gills trap organic particles. Internal Systems : Unlike gastropods (snails), bivalves lack a distinct head

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

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

For further study and visual aids, students can refer to educational platforms like Yaklass or watch lesson summaries on YouTube .

: They breathe through plate-like gills (ctenidia) located in the mantle cavity. Freshwater pearl mussels are also cultivated for pearl

: They possess an open circulatory system with a heart and vessels.