Is a shell an animal or not, and what kind of critter is a shell like?

The shell, of course, is the mantle of an animal, to be precise, a mollusk, with a special kind of glandular cell, the secretions of which form calcifications that protect the soft parts of the body.

Shells are calcifications secreted by the mantle of molluscs such as shellfish, and certainly not animals!

The number, shape and structure of shells vary greatly, and some species have one spiral shell (e.g., snail, snail, abalone); Some species have two petal-shaped shells (e.g., mussels, cockles); Some species have 8 plate-like shells, arranged in a shingle-like arrangement (such as stone turtles); Some species have 1 shell encapsulated (e.g., squid, spear squid); Some species of shells are even completely degraded (e.g. ship maggots).

The main component of the shell is 95%.

Calcium carbonate. and a small amount.

Chitin. Generally, it can be divided into 3 layers, the outermost layer is the black-brown cuticle (shell skin), thin and transparent, which has the effect of preventing carbonic acid erosion, and is composed of chitinin secreted by the edge of the mantle; The middle layer is a prismatic layer (shell), thicker, composed of prismatic calcite secreted by the edge of the mantle, and the outer and middle layers expand the area of the shell, but do not increase the thickness; The inner layer is nacre (bottom layer), which is made up of leaf-like aragonite (aragonite) secreted from the entire surface of the mantle, which has a beautiful luster and thickens as the body grows.

The main chemical composition of shell calcite and aragonite is CaCO3. The outer layer of the shell has multiple concentric ring-shaped growth lines of alternating shades of color, but it does not represent age; It is formed as a result of the inability of the mantle edge to continue secreting due to some reason (insufficient food, different seasons, reproductive period, etc.). The mantle of mollusks, with a special type of glandular cell, the secretions of which form calcifications that protect the soft parts of the body, called shells.

1. Shells are like all kinds of small animals, some like foxes.

2. Shells are like all kinds of small animals, some like kittens.

3. Shells are like all kinds of small animals, some like stars.

4. Shells are like all kinds of small animals, some like turtles.

5. Shells are like all kinds of small animals, some like fans.

Seashells are mollusc-type animals that live near waterMolluscsThe mantle shell, a calcification formed by the secretion of a special glandular cell of mollusks, protects the soft parts of the body.

Historically and prehistory, seashells have been used by people for many different purposes. However, sea shells are not the only type of shell; Shells can also be found in freshwater, such as freshwater mussels and snails, in different ecological environments. Snails on land also have protective shells.

Purpose: Shells are often used as tools because of their high strength and varied shape.

Great clams. Tridae were used as bowls, large enough to even be used as bathtubs, and as baptismal basins.

Indigenous Australians named a type of shell coconut whelk because they scooped out canoes from this shell.

in the water. Many varieties of bivalves are used as scrapers, blades, hooks and other tools, depending on their shape.

Some marine gastropods are used as oil lamps.

Oil was poured into the holes in the shells, and the rainbow tube was used as a holder for the wick.