Gdz Biologiia 7 Sumatokhin Klass Dvukhstvorchatye Molliuski May 2026

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

Урок 2: Классы моллюсков - Ростелеком Лицей gdz biologiia 7 sumatokhin klass dvukhstvorchatye molliuski

(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 : As filter feeders, they clean bodies of

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 : As filter feeders