: They are filter feeders . Water enters through an inhalant siphon, passes over the gills where food particles are trapped, and exits through an exhalant siphon.
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 gdz biologiia 7 sumatokhin klass dvukhstvorchatye molliuski
Урок 2: Классы моллюсков - Ростелеком Лицей : They are filter feeders
: Species like oysters, mussels, and scallops are important food sources for humans and marine life. They lack a radula (grating tongue)
: Like most mollusks, they have an open circulatory system where the heart pumps blood into the body cavity. Internal Anatomy Summary Characteristic Digestive
: Some species (pearl oysters) produce pearls and mother-of-pearl (nacre) used in jewelry.
: Consists of two symmetrical valves connected by a flexible ligament and a "lock" (hinge).