Gdz Biologiia 7 Sumatokhin Klass Dvukhstvorchatye Molliuski Onlain Here

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

For further study and visual aids, students can refer to educational platforms like Yaklass or watch lesson summaries on YouTube . : Students typically study the Anodonta (swan mussel),

: They possess an open circulatory system with a heart and vessels. : They breathe through plate-like gills (ctenidia) located

: They breathe through plate-like gills (ctenidia) located in the mantle cavity. Internal Systems : The nervous system is simplified,

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

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

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