 |
     |
|
|
|
: Like most mollusks, they have an open circulatory system where the heart pumps blood into the body cavity. Internal Anatomy Summary Characteristic Digestive
(class Bivalvia ) are a unique group of aquatic mollusks characterized by a shell consisting of two hinged valves and, most notably, the absence of a head . In the Grade 7 Biology curriculum by Sumatohin, they are studied as essential bio-filters and members of aquatic ecosystems. Key Biological Features
: Consists of two symmetrical valves connected by a flexible ligament and a "lock" (hinge). gdz biologiia 7 sumatokhin klass dvukhstvorchatye molliuski
: Swan mussels ( Anodonta ), thick-shelled river mussels ( Unio ), and giant clams ( Tridacna ).
: Species like oysters, mussels, and scallops are important food sources for humans and marine life. : Like most mollusks, they have an open
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
Урок 2: Классы моллюсков - Ростелеком Лицей Key Biological Features : Consists of two symmetrical
: As filter feeders, they clean bodies of water by removing organic suspension.