Question

which of these have two shells connected by a hinge, are sedentary (move very little if at all), and feed by filtering particles from air and water? class bivalvia class gastropoda

Explanation:

Class Bivalvia (e.g., clams, oysters) has two shells (valves) connected by a hinge. They are mostly sedentary and use filter - feeding to take in particles from water (and some from air in certain cases). Class Gastropoda (e.g., snails, slugs) typically has a single shell (or no shell in some cases) and has a different feeding and movement pattern.

Answer:

A. Class Bivalvia