Mollusks

cephalization

No ......mollusks are not segmented,like insects....just their body is partitioned into head, foot, and visceral hump..........but one can't take it as segmentation.........

Zebra mussles improve water clarity.

Mollusks (clams, oysters, scallops snails etc.) and Decapods (shrimp, lobsters and the like.

yes, in particular they are gastropods.

Invertebrate having a soft unsegmented body usually enclosed in a shell.

No

It is well known that the clam is by far the most active mollusk

Since cephalodpods are animals such as octopus, squid, and cuttlefish, they usually either entwine their tentacles around their prey to trap it, or they use their suction cups to stick to prey and then consume it.

the sami and lyes

Yes snails do have scales, a little known fact about snails is that they are related to dragons and other giant lizards like Nessy (The Loch Ness Monster).

Well they appeared in the Precambrian Era, as bacteria. The Paleozoic, as trilobites, brachiopods and fish.

Most people believe the second class of mollusks is referring to a school because many fish together is noted as a "school" of fish. This is not the case however. The second class mollusks noted as a "gang". Second class mollusks are the mollusks that, if they were humans, would be classified as "white trash". These mollusks are the dirty bottom feeders that partake in vile activities/ behaviors which gives them the name second class, or nicknamed "classless mollusks".

In their ecosystem, the second class mollusks are in abundance because predators prefer class over "sass". The first class mollusks, which are the predators' choice, show disgust towards the second class mollusks and they even outcast them. It seems as if they are upset to be part of the same species.

The second class mollusks are not eaten by humans, but soon they will be the only mollusks that exist because they have few to no predators.

Chitons are a type of marine mollusk. They protect themselves with their large and durable shells, which cover most of their body.

there are about 10,000 species in the monera kingdom.

These are called valves- some molluscs have two and are called BIVALVES, whilst others have three and are called TRIVALVES. The latter are held to be higher up the evolutionary scale. The bivalves are the clams, mussels, oysters and scallops. The adults all have two hinged shells (valves). Some of these animals circulate water carrying the microorganisms that they eat and oxygen for respiration through tubes called "siphons" that they can extend from between the shells on the anterior end so they can stay safely hidden in the mud or sand.

The function of a mantle on a mollusk is the same as the respiratory system in mammals. It is also part of the feeding structure in bivalves.

Humpback whales migrate every year. This is similar to every other whales. They usually migrate to either the Arctic or Antarctic regions for food then migrate to around the equator where they breed.

Some bivalves are epifaunal: that is, they attach themselves to surfaces in the water, by means of a byssus or organic cementation. Others are infaunal: they bury themselves in sand or other sediments. These forms typically have a strong digging foot. Some bivalves can swim.

Chitons creep along slowly on their muscular feet and cling to rocks.

Most snails move by gliding along on their muscular foot, which is lubricated with mucus. This motion is powered by succeeding waves of muscular contraction which move down the undersurface of the foot. They produce mucus in order to aid locomotion by reducing friction, and the mucus also helps reduces the snail's risk of mechanical injury from sharp objects.

Endoskeleton

From wikipedia

An endoskeleton is an internal support structure of an animal, composed of mineralized tissue. Endoskeleton develops within the skin or in the deeper body tissues. The vertebrate is basically an endoskeleton made up of two types of tissues (bone and cartilage). During early embryonic development the endoskeleton is composed of notochord and cartilage. The notochord in most vertebrates is replaced by vertebral column and cartilage is replaced by bone in most adults.In three phyla and one subclass of animals, endoskeletons of various complexity are found: Chordata, Echinodermata, Porifera, and Coleoidea. An endoskeleton may function purely for support (as in the case of sponges), but often serves as an attachment site for muscle and a mechanism for transmitting muscular forces. A true endoskeleton is derived from mesodermal tissue. Such a skeleton is present in echinoderms and chordates.

Snails, top shells, cones, sundials, tiny augers, Florida augers, murex, olives, tulip shells, cowries, periwinkles, and limpets