Mollusks' group of organs is called a

It is called the visceral mass

The structure that mollusks use to excrete wastes is known by the name of nephridia.  Mollusk is the other name for shellfish. there are three varieties of shell fish present. Hatcher footed, Belly footed and head footed variety of shellfish are available.

I’m not exactly sure what your trying to ask, but if it’s how an organelle is similar to a body system or a part a nucleus is like a in function. but i don’t fully understand what you’re trying to ask