Excretion

The mollusks undigested food becomes a solid waste that is eliminated through the anus as feces. Another form of waste removal for mollusks is Cellular Metabolism which produces nitrogen-containing waste in the form of ammonia. The poisonous ammonia is removed through the body fluids. The mollusks use a simple tubed shaped organ called the nephridia to eliminate the ammonia from the blood stream and to the outside.