What is a sink? Detailed answer

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What is a sink? Detailed answer

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What is a sink?

Can you imagine how many different types of coatings exist to protect living organisms? Nut shells, egg shells, tortoise and crab shells, snail shells.

A shell is a hard shell covering something living. It was made either by its owner himself or by his parents. The shell consists of a certain formation. Walnut shells are from woody matter, other shells are from calcium carbonate (lime). Still others are made of quartz, a kind of glass material.

The shell protects the life hidden in it. Nuts and eggs are not permanently coated. The inner living part - the seed or chick - must grow and crack open the shell to come out.

Crabs and crayfish are not always completely surrounded by their shell. It is made of individual plates held together by a soft substance. This allows the animal to move and bend.

Some creatures, such as beetles, grow inside their hard shells as long as they fit inside. Then it splits, and the insect crawls out. Beneath it is soft and stretchy skin. After a certain time, it hardens and turns into a new shell.

And there are creatures in which the shell is part of the body. Turtle shell is a bone covered with special plates. From above, it consists of her ribs and spine, from below, too, from bone. A turtle cannot live without a shell, just like a person without a backbone and ribs.

A large group of living creatures that have a shell are molluscs. Snails are one of the varieties of this group. Oysters, Hungarians, scallops and many others are bivalves. When threatened, they can completely slam their shells shut.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

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