Do shells have life and why?

Shellfish, of course, are alive.

Most shellfish shells are lifeless, which can be understood as a result of secretions.

The shell is alive, and the shell is the exoskeleton of the back, so it is inanimate.

The shells also grow along with the scallops, etc., and it cannot be said that they are lifeless, and they only stop growing when the scallops die.

Non-professional, just confused.

First of all, living things can be reproduced.

And then, no more.

The shell is the exoskeleton of many animals of the mollusk phylum Gastropoda, commonly known as shellfish, and its main role is to protect the soft body inside.

When shellfish grow, they secrete calcareous matter with calcium carbonate as the main component, and doped with protein, forming a hard shell, which is distributed on the outside of the body, and some are one, arranged in a spiral gradient pattern, called a snail. Some are two pieces that can be split in pairs, called shellfish. Due to the easy denaturation and loss of proteins in the shell, the outer surface of the shell (or snail shell) usually appears rough, while the inner surface appears smooth and pearl-like due to the continuous secretion of calcium carbonate and protein coating by the body.

The composition of pearls is the same.

It is also because calcium carbonate and protein solidify once they are coated on the inner walls of the shell, and without blood vessels, muscles, and nerve tissue, the shell will not be alive.

With the denaturation of proteins, the shell loses its luster very quickly. This is also the reason for the so-called "people are old and yellow".

It is to protect the local ecological environment.

The first is to protect the local ecological environment, especially seashells, corals, starfish and other marine creatures that are easy to pick up on the coast.

Secondly, there are many rare species of shellfish, and the shells of these shellfish have high economic value, so it is prohibited by the customs to carry them without permission, which involves smuggling.

Basic Information. The shell (bèi ké) is the mantle shell of mollusks that live near water, a calcification formed by the secretion of a special glandular cell of the mollusk that protects the soft parts of the body. Compared with natural calcium carbonate minerals in nature, shells have a unique multi-scale and multi-stage "brick mud" assembly structure, and have excellent characteristics such as good toughness and high strength due to their multi-level layered structure.

The shell is composed of about 95% caCO3 and about 5% organic matter.

Due to the different bodies of water, shellfish are divided into different species that live in saltwater, such as the sea, or in freshwater, such as rivers and streams. The most famous marine shellfish is the grayish-black mussel, and the pearl mussel is widely distributed in freshwater basins.

If it's a simple shell, it's not a living thing, and if there's a mollusk in it, it's a living thing. The simple shell is the mantle shell of mollusks that live near water, and it is a calcification, the main component is calcium carbonate, and it does not have the basic characteristics of living things.

The simple shell is a calcification formed by the secretion of a special glandular cell of a mollusk that protects the soft parts of the body.

The main components of shells are calcium carbonate and organic matter, of which the calcium carbonate content is as high as about 95%.

The essential difference between living things and non-living things is whether they are alive or not, and living things have the following characteristics: they have a cell structure, can metabolize new fibers, can grow wide and long, and have stress and so on.

Shells are not living things, shellfish are living things, mollusks. The shell is the shell of shellfish, and only the shellfish that are composed of the soft tissue bones contained inside it are living organisms, and the shell is very hard, which has the basic function of protecting the bones, and it also has some research value. As a common marine creature, there are many types of seashells.

Seashells are not living things.

The shell is the shell of mollusks that live near water, and is a calcification formed by the secretion of a special glandular cell of mollusks that protects the soft parts of the body. It is relatively hard, and its most basic function is to protect the soft tissues in the body, so as to facilitate the long-term survival of mollusks from injury.

In addition to its most basic functions, the shell has some other functions. The shell contains a large amount of potassium, calcium, magnesium and other mineral elements, which can help the body reduce serum cholesterol levels, protect the cardiovascular system, and also help strengthen bones and prevent osteoporosis.

There are many common species of shells, such as oysters, snails, clams, scallops, mussels, white shells, razor clams, etc., among which oysters and clams are common seafood on our dinner table. Eating some seafood is good for protein, but people with a history of seafood allergies should be careful about eating it.

The shell is the exoskeleton of the mollusk, which is a part of the organism, not a living organism, if the shell has a soft body in the shell, then the shell and the shell or the body in the rock together are living things. Shells are calcifications formed by the secretions of a special glandular cell of mollusks that protect the soft parts of the body.

The formation of shells is a process of biomineralization, that is, the process of molecular manipulation with a small number of organic macromolecules as a template, and the formation of organic materials in a highly orderly manner.

In a geological sense, shells are the most common form of preservation in fossils, and are often used to determine the phylogenetic evolution of geological formations, the exact age of strata, and the classification of shellfish populations.

2) [conchylium] The shell of a mollusk.

3) [shuck] The shell of an oyster or clam.

4) Gastropoda[detailed explanation] BeikeThe mantle of the soft body of the animal, with a special glandular cell, the secretion of which forms calcifications that protect the soft parts of the body, called the shell. The number, shape and structure of shells vary greatly, with some species having 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 components of shells are 95% calcium carbonate and a small amount of 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 the pure 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 can be thickened as the body grows. The main chemical component of 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.).

In short, shells, both alive and dead