What is a clam? Detailed answer

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What is a clam? Detailed answer

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What is a clam?

The word "shellfish" sounds like the name of some prehistoric animal, but it's not. Mollusks are a large class of living organisms that lack a skeleton, including snails and veners, oysters and octopuses. They have a variety of sizes: from microorganisms almost invisible to the naked eye to giant cephalopods, reaching 15 meters in length! They can live in the tropics and in the arctic regions, in the depths of the sea and on land!

Although there are more than 60 species of mollusks, they all have common features. All molluscs have a soft, slimy, boneless body covered in large folds of flesh called the "mantle".

In many molluscs this mantle is covered with a hard shell, as in oysters, while in others there is no protective shell. Almost all mollusks have something like a "leg", which is an extension of the mantle, and it helps them move around. With its help, they can swim or walk, burrow into the mud or make moves in the tree, depending on the specific species. There are five groups of mollusks, and representatives of three of them are widely known.

The first of these common groups is called "gastropods". Among the gastropods, one can name snails, slugs, periwinkles, which all have one large "leg" on their stomach. All gastropods have a head with eyes and antennae, and many of them wear a spiral shell on their backs. The second common group of mollusks are the double-branched. Oysters, venerki, mussels, scallops and many others belong to this group. All bibranchs have a shapeless body protected by a double, opening shell. All of them live in water.

The last known group of mollusks is called "cephalopods". Representatives of this group have many arms, or tentacles, located around the mouth. These include octopuses, squids, cuttlefish, nautiluses and others. They are aristocrats among mollusks, as they are distinguished by their nervous system. All molluscs lay eggs, but some only a few and others a lot. For some, the offspring appear as larvae, for others, the young are a miniature copy of their parents.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

How is Batman related to the English idiom about stupid people?

In England, there is the village of Gotham, famous for the idiom "Wise Men of Gotham", meaning simple and stupid people. According to legend, the inhabitants of Gotham, having learned about the plans of the king to settle nearby and having estimated their expenses for the maintenance of his court, decided to play fools in front of the royal ambassadors. To do this, the villagers indulged in stupid work, for example, drowning an eel in a pool of water or building a fence around a cuckoo sitting on a bush, and the king eventually chose another place for the house. New York's nickname Gotham came from a comparison in a satirical short story by Washington Irving. It was later chosen to be the name of the city where Batman lives.

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Volkswagen Group spoke about "smart" automotive lighting systems that will improve road safety in the future.

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