Which describes a difference between bivalves and cephalopods? Bivalves use tube feet for movement, and cephalopods use muscular feet for movement. Bivalves live only in ocean environments, and cephalopods live in a variety of aquatic environments. Bivalves use a radula to feed, and cephalopods use filter-like structures to feed. Bivalves have an open circulatory system, and cephalopods have a closed circulatory system.

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Explanation:

Bivalves

The mollusks that have a hinged, two-part shell joined by strong muscles are called bivalves. Clams, Oysters, and Scallops are bivalve mollusks and are a familiar food source. These three animals pull their shells closed by contracting powerful muscles near the hinge. The open these shells they have to relax their muscles.

These animals are well adapted for living in water. For protection, clams burrow deep into the sand by contracting and relaxing their muscular foot. While on the other hand Mussels and Oysters attach themselves with a strong thread or cement to solid surfaces. This method keeps waves and currents from washing them away. Scallops are different. They use their shell to open and close rapidly. As water is forced out, the scallop is rapidly moved in the opposite direction.

Cephalopods

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This group are the the most specialized and complex group. The animals in this group are squid, octopuses, cuttlefish, and chambered nautiluses. The word cephalopod means "head-footed" and describes the body structure of the invertebrates. Cuttlefish, like most cephalopods, have a large and well-developed head.  Their foot is divided into may tentacles with strong suction cups or hooks for capturing prey.  All cephalopods are predators. they feed on fish, crustaceans, worms, and other mollusks.  All cephalopods live in oceans and area adapted for swimming.  

Bivalves

Squid and octopuses have a well-developed nervous system and large eyes which are similar to human eyes. Cephalopods are the only mollusks that have closed circulatory system, which the blood contains food and oxygen that moves through the body in a series of closed vessels. Just like a human's blood that moves through their blood vessels.  Squids and other cephalopods have a water-filled cavity between an outer muscular covering and its internal organs.