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.
Both cellular membranes and gills are involved in facilitating the exchange of gases. Cellular membranes in individual cells allow for the diffusion of gases like oxygen and carbon dioxide, while gills in aquatic organisms enable the uptake of oxygen from water and the release of carbon dioxide.
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.
Bivalves obtain oxygen through their gills, which are feathery structures that extract oxygen from water as it passes through the bivalve's mantle cavity. The gills have a large surface area for efficient oxygen exchange, allowing the bivalve to breathe while submerged.
The function of gills on a mushroom is to hold and release the spores that a mushroom produces.
to BREATH!
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 primary function of external gills in aquatic animals is to exchanges gases. However, gas exchange is more difficult with external gills.