Can oysters live out of water? Detailed answer

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Can oysters live out of water? Detailed answer

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Can oysters live out of water?

If you look at an open oyster lying in its shell, it is hard to believe that this creature is capable of performing many complex functions. Let's take a closer look at the oyster and look at its life.

There are over 100 varieties of oysters that vary in shape, size and shell depending on the environment. The body of the American oyster is located in the left, concave half of the shell; the right or upper side is usually flat. The narrow end of the shell is at the front of the oyster; behind is a wide, rounded part. The two halves of the shell, or valves, are fastened together by a flexible ligament. On the inside of the sash there is a delicate film called the "mantle". The oyster has two rows of tentacles growing out of its mantle, which are used for defense. These tentacles respond to any disturbance, change in light, or any stimulus. From them, a signal is transmitted along the nerves in the mantle to the muscle that closes the shell.

The oyster has no ability to attack other creatures, so it can only defend itself by closing its shell tightly and keeping it tightly sealed. This happens due to a special muscle. Thanks to this muscle, all edible oysters continue to live even if they are removed from the water. It is known that some of them can be kept in good condition for about four months if they are kept at a temperature slightly above zero. But if they are heated, shaken, or handled carelessly, then the muscle weakens, the valves open, the water contained inside leaves, and the oyster soon dies.

The oyster breathes with gills and sucks in water to get oxygen. The oyster feeds on microorganisms present in the water. They are so small that they can only be seen through a microscope. However, the oyster is sensitive enough to select only those microorganisms that are the right size and shape, as well as some other requirements.

The oyster has a narrow "pharynx", which is connected to the stomach and intestines. Here the food is ground and digested with the help of an enzyme. There are also blood cells that surround the food and digest it. Oysters also have a heart, arteries, veins and cavities, as well as a complete circulatory system. The heart beats at a frequency of 15-24 beats per minute. The blood of an oyster is colorless. A cursory description gives you an idea that the oyster is not as simple as it might seem!

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

What is the Renaissance?

Do you know what the word "Renaissance" means? This is the French word for "Renaissance". The Renaissance is the Renaissance that took place in Europe from the XNUMXth to the XNUMXth century. In the Middle Ages, which preceded the Renaissance, many things in life were rejected. During the Renaissance, education revived, trade, art, music, literature and science flourished.

The Renaissance changed the whole way of life in Europe. Until that time, people lived in large estates, estates. There were very few cities. All social life was concentrated in knight's castles or bishops' palaces. Europe was divided into countless little states, each ruled by a prince or duke.

During the Renaissance, life changed completely. In connection with the development of trade, industry and commerce, cities grew rapidly. Wealthy merchants became very important. Instead of numerous small states, large ones arose. Nations began to form. People started minting money. Faith has also been questioned. People became more interested in the events in the world and less concerned about the afterlife. A rebellion arose against the foundations and ideas of the Roman Catholic Church, a reformation movement appeared, which led to the establishment of the Protestant religion.

The Renaissance did not come about suddenly, although it is sometimes associated with 1453, the year Constantinople fell to the Turks, or 1440, when printing was invented. Nevertheless, over the centuries, the forces that contributed to the emergence of the Renaissance grew.

The Renaissance reached its highest development, first in Italy, and then spread to other European countries. A large group of great artists appeared in Italy, among them Leonardo da Vinci, Michelangelo, Raphael, Botticelli, Cellini and others, whose work we admire to this day.

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Siberian tundra under the threat of destruction 12.06.2022

Even if global warming could be drastically curtailed by reducing emissions, only a part of the northern Russian biome, including the island of Taimyr and most of the Palearctic, could survive. If current greenhouse gas emissions are halved by 2100, only 2500% of the Siberian tundra will remain in 5,7.

This conclusion was made by two German scientists Stefan Kruse and Ulrike Hertzshu from the Institute of Polar and Marine Research. Alfred Wegener after developing a climate model (named LAVESI) specifically designed to predict the changing relationship between the Siberian tundra and taiga.

The tundra is characterized by permafrost, poor animal diversity, and low vegetation, including shrubs, mosses, and lichens. The very cold average temperature does not allow many trees to grow, with the exception of willows and birches no more than a couple of meters high. The taiga, on the other hand, is a boreal forest located south of the tundra and consisting mainly of large coniferous trees such as larches.

The increase in temperature caused by global warming is allowing taiga trees to move north, "eating" valuable tundra soil - the main habitat of reindeer. The tundra is also home to arctic foxes, bears, wolves and lemmings, as well as many species of birds nesting.

If they disappear, as the German researchers suggest, the consequences will be catastrophic not only for biodiversity, but also for the indigenous population living along the natural resources of these lands, such as the Nenets.

The larger the area of forests, the more heat will be absorbed by the trees, which will lead to warming in the Arctic. This will provoke more cataclysms around the world, lead to the death or migration of species, and also complicate the delivery of goods by sea.

But even worse, as the permafrost melts, the tundra could release large amounts of accumulated greenhouse gases into the atmosphere - up to 1400 gigatonnes globally - which will increase global warming.

Scientists have developed a climate model capable of predicting the fate of the entire Siberian tundra, which stretches for about 4 km. They predict that if nothing is done to limit greenhouse gas emissions, the Siberian tundra will disappear by the year 000, being completely replaced by boreal forest. But even if we succeed in reducing carbon emissions, the tundra of the next few centuries will not be the same as it is today.

For example, the elimination of emissions by 2100 will save only 32,7% of the biome, which will be divided into two very remote regions - Chukotka and Taimyr Island. This will affect wildlife. On the other hand, if by the end of the century we manage to halve emissions, then in 2500, a little less than 6% will remain in place of the Siberian tundra.

One of the main problems of the tundra is that the advance of the taiga is almost impossible to stop even with further cooling of the climate. Researchers believe that people need to pay special attention to the environment right now, reducing greenhouse gas emissions and abandoning fossil fuels.

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