Gdz Biologiia 7 Sumatokhin Klass Dvukhstvorchatye Molliuski May 2026

: Like most mollusks, they have an open circulatory system where the heart pumps blood into the body cavity. Internal Anatomy Summary Characteristic Digestive

: Consists of two symmetrical valves connected by a flexible ligament and a "lock" (hinge). gdz biologiia 7 sumatokhin klass dvukhstvorchatye molliuski

: Species like oysters, mussels, and scallops are important food sources for humans and marine life. : Like most mollusks, they have an open

: Swan mussels ( Anodonta ), thick-shelled river mussels ( Unio ), and giant clams ( Tridacna ). : Swan mussels ( Anodonta ), thick-shelled river

: Some species (pearl oysters) produce pearls and mother-of-pearl (nacre) used in jewelry.

: As filter feeders, they clean bodies of water by removing organic suspension.

Mouth (near the foot), stomach, liver, and intestine. They lack a radula (grating tongue). Plate-like gills (ctenidia) located in the mantle cavity. Excretory Two kidneys that open into the mantle cavity. Nervous Simplified, consisting of three pairs of ganglia. Ecological and Economic Importance