Secondary education and schools

What are organs? This question can be followed by several different answers at once. Find out what the definition of this word is, in what areas it is used. Last modified: 2025-01-23 12:01

When a person was just learning to count, his fingers were enough to determine that two mammoths walking by the cave are smaller than that herd behind the mountain. Last modified: 2025-06-01 07:06

The article describes in detail the most important muscles - skeletal. Their structure, principles of operation, functions, diseases and ways of strengthening are considered. Last modified: 2025-01-23 12:01

A person is active for 14-16 hours a day, and some longer. This period is called wakefulness and is vital for each of us. In the article we will give a definition of this concept, talk about its meaning, talk about sleep, its lack and find out what it leads to. Last modified: 2025-01-23 12:01

Many of you have certainly heard the word "ounce". But does everyone know what it means? This is an outdated measure of weight and not only. By the way, this concept has a rich history. And in some sectors of the economy, this measure is indispensable. So how many grams does 1 ounce weigh?. Last modified: 2025-01-23 12:01

Well-groomed hair is the dream of any woman. Spending a lot of time and effort on different styling, curling and coloring, many girls forget that the key to a beautiful hairstyle is he althy hair. To make it so, you need to know what the structure of the hair is, what is its life cycle, the causes of pathological changes and how to eliminate them. Last modified: 2025-01-23 12:01

The term "ancient literature" is understood as a peculiar layer of Russian culture, covering the period from the 11th to the 17th centuries. The works created in these centuries are distinguished by originality and originality. The differences are primarily due to the fact that the culture of Ancient Russia was not like any other in the medieval period. Last modified: 2025-01-23 12:01

No matter how they scold nuclear energy for the danger posed by nuclear power plants, humanity does not shine to abandon them in the near future. What is a nuclear chain reaction and how is it related to the concept of critical mass. Last modified: 2025-01-23 12:01

Do you know what a peninsula is and how it can differ from the main part of any continent? From a geographical point of view, this is a piece of land that can be surrounded on three sides by the waters of the seas or oceans. It is undoubtedly attached to the mainland, therefore it is always part of a certain state. It is these characteristics that are famous for the Labrador Peninsula, which is located in the eastern part of Canada. Last modified: 2025-01-23 12:01

The average adult has about 30 trillion cells. And every day, thousands of new units are replicated from old, worn-out or damaged ones. Cell nutrition is the process of providing nutritional raw materials in order to create new and maintain old units. In addition, some nutrients also protect against damage and provide the body with the energy it needs. Last modified: 2025-01-23 12:01

We know that many things can be faked: watches, shoes, socks, jewelry. But can interest be faked? Let's talk about this, because the phrase "genuine interest" has fallen into the zone of our attention. Consider the meaning, synonyms and the question of the authenticity of passion. Last modified: 2025-01-23 12:01

How many states are located on the European part of the Eurasian continent? Which are the largest, and where is the smallest population?. Last modified: 2025-06-01 07:06

Free market relations: what are the characteristics of this model, and how good is it for the present?. Last modified: 2025-01-23 12:01

Which is correct: marketing or marketing? Where to put the stress so as not to be mistaken, and why do so many people pronounce this word differently?. Last modified: 2025-01-23 12:01

What is text analysis? How to do it? Each student asks himself such a question, having received an assignment in the Russian language or literature. The answer can be found in the article. Last modified: 2025-01-23 12:01

How to plan a description of a lake and what points should be included for a complete picture of a geographical feature?. Last modified: 2025-01-23 12:01

Why do we need a reasoning essay plan? To make it easier to write. And what items are included in the plan, you can find out from the article. Last modified: 2025-01-23 12:01

What is the analysis scheme of a lyric poem? What points need to be included in order to understand the meaning and attitude of the author?. Last modified: 2025-01-23 12:01

The division of the entire globe into countries and territories reflects the political map of the world. No geographical map is characterized by such variability as political. In space and time, during the development of human civilization on five continents, states either arose, developed and flourished, then countries and cities disappeared, giving grounds for changes on the political map and material for scientists to study. Last modified: 2025-01-23 12:01

Variability in biology is called nothing more than the properties of organisms to acquire new features that would differ from their ancestors, as well as individual states of parental organisms compared to descendants during the period of development of an individual organism. The diversity of traits among members of the same species is also called variability. Last modified: 2025-01-23 12:01

Sweden and Switzerland are confused by the whole world, but, you guessed it, these are different concepts. The countries are located several thousand kilometers apart, their populations are approximately the same with a difference of almost one million people. Last modified: 2025-01-23 12:01

Today we will answer a question that is of great interest to many netizens: "Where is Cuba?" Its place on the world map is between South, Central and South America, the island of Youth, its territory is 1570 small islands that are part of the Greater Antilles. Last modified: 2025-01-23 12:01

A plane, along with a point and a straight line, is a basic geometric element. With its use, many figures in spatial geometry are built. In this article, we will consider in more detail the question of how to find the angle between two planes. Last modified: 2025-01-23 12:01

Triangle is the simplest figure closed on the plane, consisting of only three interconnected segments. In geometry problems, it is often necessary to determine the area of u200bu200bthis figure. What do you need to know for this? In the article we will answer the question of how to find the area of a triangle on three sides. Last modified: 2025-01-23 12:01

A typical task in physics is to calculate the volumes of various substances under certain external conditions. One of these substances is mercury - a metal with unique physical properties. In this article, we will consider ways to solve the following task in physics: what volume does 100 moles of mercury occupy?. Last modified: 2025-01-23 12:01

Every student who carefully studied the periodic table, probably noticed that, in addition to the number of a chemical element, it contains information about the weight of its atom. In this article, we will look at what molar mass is and where it is used. Last modified: 2025-01-23 12:01

After the students got acquainted with the concept of mass and volume of substances in physics, they study an important characteristic of any body, which is called density. The article below is devoted to this value. The questions of the physical meaning of density are revealed below. The density formula is also given. Methods for its experimental measurement are described. Last modified: 2025-01-23 12:01

Volume and surface area are two important characteristics of any body that has finite dimensions in three-dimensional space. In this article, we consider a well-known class of polyhedra - prisms. In particular, the question will be solved how to find the surface area of a straight prism. Last modified: 2025-01-23 12:01

When designing many structures and vehicles, a number of physical characteristics are taken into account that a particular material must have. One of them is density. Consider in the article what it is and how to find the density. Last modified: 2025-01-23 12:01

Any movement of a body in space, which leads to a change in its total energy, is associated with work. In this article, we will consider what kind of quantity it is, what mechanical work is measured in, and how it is denoted, and we will also solve an interesting problem on this topic. Last modified: 2025-01-23 12:01

Kinematics is one of the important sections of mechanics, which considers the laws of movement of bodies in space (the causes of motion are studied by dynamics). In this article, we will consider one of the main quantities of kinematics, we will answer the question: "What is a path in physics?". Last modified: 2025-01-23 12:01

Metals are chemical elements that make up most of the periodic table of D. I. Mendeleev. In this article, we will consider such an important physical property as density, and also give a table of the density of metals in kg / m3. Last modified: 2025-01-23 12:01

In order to make it convenient to work with different quantities in physics, their standard notation is used. Thanks to them, everyone can easily remember many important formulas for certain processes. In this article, we will consider the question of what g means in physics. Last modified: 2025-01-23 12:01

Everyone understands that work is a kind of social activity of a person that he needs to ensure his existence. However, in physics there is also a similar concept that has a completely different meaning. What is work in physics, this article will answer. Last modified: 2025-01-23 12:01

One of the best ways to organize your thoughts is to make a plan. This skill is necessary for everyone, in particular, schoolchildren. During their studies, children very often make plans for paragraphs, essays, and other. Last modified: 2025-01-23 12:01

Pyramid is a three-dimensional figure, the base of which is a polygon, and the sides are triangles. The hexagonal pyramid is its particular form. In addition, there are other variations when at the base of a triangle (such a figure is called a tetrahedron) there is a square, rectangle, pentagon, and so on in increasing order. When the number of points becomes infinite, a cone is obtained. Last modified: 2025-01-23 12:01

The topic of arithmetic mean and geometric mean is included in the mathematics program for grades 6-7. Since the paragraph is quite simple to understand, it is quickly passed, and by the end of the school year, students forget it. But knowledge in basic statistics is needed to pass the exam, as well as for international SAT exams. And for everyday life, developed analytical thinking never hurts. Last modified: 2025-01-23 12:01

Preparing for the unified state exam is a difficult and responsible task. In order to successfully cope with the calculation problems, it is necessary to know the algorithm for solving them. Last modified: 2025-01-23 12:01

On clear days, Kauai's west coast overlooks a small island. It is only 17 miles away, but for most people in the state, this is the only way to see Niihau Island. It's known as Hawaii's Forbidden Island, and that nickname fits it perfectly. Last modified: 2025-01-23 12:01

The works of Mikhail Evgrafovich S altykov-Shchedrin are much more complicated than they seem at first glance. This becomes clear if we analyze the fairy tale by S altykov-Shchedrin "The Selfless Hare". Last modified: 2025-01-23 12:01