Gdz Biologiia 7 Sumatokhin Klass Dvukhstvorchatye Molliuski Today

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

: The body is laterally compressed and divided into two main parts: the trunk and the wedge-shaped foot . Unlike gastropods, bivalves lack a head, tentacles, and eyes. gdz biologiia 7 sumatokhin klass dvukhstvorchatye molliuski

Урок 2: Классы моллюсков - Ростелеком Лицей : Some species (pearl oysters) produce pearls and

: Species like oysters, mussels, and scallops are important food sources for humans and marine life. Plate-like gills (ctenidia) located in the mantle cavity

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

: 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).