Mollusks

At one point in Earth's history, the nautilus was once a powerful predator, but as the world evolved many other organisms surpassed this creature. Now this species is found only in the Indo-Pacific region where their parrot-like beaks grab shrimp, crustaceans, and other small fish for dinner. The taxonomy on this creature is the species Nautilus, the family Nautilidae, the class Cephalopoda, the phylum Mollusca, and the kingdom Animalia.

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Scientist have found that the worlds largest octopus was 13 feet long that they found lurking through the depths.

Bivalves, univalves, and cephalopods are all types of mollusks. So are gastropods.

I believe you're referring to a structure called a Radula.

I say its the snail.

A nautilus resembles a squid with a shell. They are rather hard to explain. See the related link for more information and pictures of nautiluses.

Mollusks are defined as Bivalves. They are called Bivalves because they have two shells. Cnidarians such as Jelly Fish do not have shells which define a bivalve (mollusks).

Most mollusks have shells outside their soft bodies. The shell is a mollusk's skeleton. It is part of the animal and the mollusk is attached to it by muscles. The soft animal inside can never leave its shell and come back to it.

The shell is made of a form of limestone and is built by the mollusk itself. Certain glands in the mollusk are able to take limestone from the water and deposit it in tiny particles at the edge of, and along the inside of, the shell. As a mollusk grows in size, its shell increases in thickness and size.

The shell of a mollusk consists of three layers. The outside is covered with a thin layer of hornlike material that contains no lime. Under this is a layer of carbonate of lime. The inside layer is the "mother-of-pearl", or nacre. It is made up of very thin alternate layers of carbonate of lime and a horny substance.

The coloring of the shell comes from some glands of the mollusk that contain coloring matter. So a shell may be spotted, all one color, or marked with lines.

Octopuses have gills which exchange carbon dioxide for oxygen in the water.

It might be sick

take to a local vet to check it up

if nothing works give it a nice funeral

Mollusks and segmented worms have a one-way digestive system, a separate mouth and anus, and their larvae are very similar. This is the best evidence that they have a common ancestor.

8 chambers!

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The niche of a cuttlefish is in the sand and mud substrate in shallow waters up to three to 86 meters. Cuttlefish usually will walk on the ground.

Mesonychoteuthis hamiltoni

Yes they do

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It is a cephalopod that has a spiral shell with pale pearly partitions.

A cuttlefish has a solid, bone-like structure, known as a cuttlebone. This can be carved easily, and one application is to make a casting mould out of it.

Mollusks do not have antennae at all. Insects have antennae.

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Short Answer:

Fish do not make sea shells.

Long Answer:

Sea Shell: the hard protective outer case of a mollusk or crustacean. That includes the calcium carbonate shells made by clams and snails and the chitin/calcium shell of crabs and lobsters and the like.

Fish: fish are a catch-all group that includes species with backbones, fins but no limbs, get oxygen through gills, and live in water. This includes hagfishes, sharks, bony fishes and more.

If you consider a sea shell to be anything hard you'd find washed up on the shore, perhaps you might consider fish bones to be a sea shell, but this would be wrong, because a shell is usually on the outside of an organism. Many animals are called fish which aren't fish, like starfish and jellyfish, but they are not true fish.

In the Devonian era, around 400 million years ago, fish with bony armored plates called placoderms swam the sea. This is probably the closest to sea shells you can get from a fish, since it's outside the body and hard, but they aren't alive today.

Therefore, since fish are vertebrates, and sea shells come from invertebrates, fish do not make sea shells.

They Eat With Their Mouth!!

-Melia

They are plants- none of the above.