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They Expel Waste
Bivalves feed by filtering food from the water as it passes through their gills. They have specialized gills that capture food as it passes through with the water.
Three main body regions of bivalves are 1) Foot 2) Visceral mass 3) Gills.
The gills of bivalves that I have seen, I would describe as looking like a piece of screening covered with cilia.
No.They have a rudimentary brain, eyes; a mouth and gills, but none of it is organized into a head.
GillsThe gills perform the same function.
The function of gills on a mushroom is to hold and release the spores that a mushroom produces.
No, Bivalves are not toxic. Bivalves are any kind of animal with two shells, like a clam or mollusk. They cannot bite you, or sting you. If you do not cook them when you eat them, you will get food poisoning.
to BREATH!
The primary function of external gills in aquatic animals is to exchanges gases. However, gas exchange is more difficult with external gills.
There is no such animal as a "univalve", however "bivalves" are filter feeders and filter seawater through their gills to pick up trace amounts of food.
The water comes through the incurrent siphon and gets flushed out the excurrent siphon