Notes, summaries, assignments, exams, and problems for Secondary education

Sort by
Subject
Level

Human Excretory System and Urinary Function

Classified in Biology

Written on in English with a size of 3.38 KB

The Human Excretory System

All cells produce wastes and toxins; if these accumulate, they can be harmful. They must be eliminated through the function of excretion. The blood carries these substances to the organs responsible for their elimination. The organs involved in excretion include:

  • The kidneys: They eliminate toxic substances through urine and form part of the urinary system.
  • Lungs: They expel CO2.
  • Liver: It eliminates wastes from medicines, drugs, and other substances by forming bile (which is also used in digestion).
  • Sweat glands: They eliminate wastes through the production of sweat. Sweat is very similar to urine, but more diluted.

Anatomy of the Urinary System

The urinary system produces and expels urine. It consists of the following

... Continue reading "Human Excretory System and Urinary Function" »

A Norwegian Family's Journey: Life at St. Peter's School

Classified in English

Written on in English with a size of 2.38 KB

1. Loss and New Beginnings

The father dies of pneumonia. His favorite daughter had just died a few weeks earlier, and this caused him to fall into a deep depression. He was so depressed that he didn’t mind living or dying.

After the father's death, the family didn’t go back to Norway. The mother was pregnant and had to take care of six small children. Nevertheless, she wanted her children to go to an English school, as her husband had wanted.

2. The Sweet Obsession and the Dead Mouse

The kids were obsessed with the sweets from a particular shop. They had a hole under the floor in their classroom where they hid some sweets and ate them at the end of class. One day, they find a dead mouse inside the hole and decide to place it inside a candy... Continue reading "A Norwegian Family's Journey: Life at St. Peter's School" »

Essential English Grammar Structures and Verb Patterns

Classified in Other languages

Written on in English with a size of 4.32 KB

Narrative Tenses

  • Past Simple

    I did (yo hice)

    Used with specific past time markers: last summer, three years ago, in 1998, when I was twelve.

  • Present Perfect Simple

    I have done (he hecho)

    Used with: for five years, since March, since 1998, how long?, yet, just, already, ever, never.

  • Present Perfect Continuous

    I have been doing (he estado haciendo / llevo haciendo)

  • Past Perfect Simple

    I had done (había hecho)

  • Past Perfect Continuous

    I had been doing (había estado haciendo)

Gerunds

The Gerund (Verb + -ing) is used:

  1. After Prepositions

    Examples: think of, interested in, tired of, talk about.

  2. As a Subject

    Example: Working is necessary.

  3. After Certain Verbs and Expressions

    Verbs: appreciate, like, imagine, postpone, resent, delay, enjoy, keep, practise, risk, discuss,

... Continue reading "Essential English Grammar Structures and Verb Patterns" »

The Necessity of Zoos: Balancing Conservation and Ethics

Classified in Social sciences

Written on in English with a size of 2.22 KB

Opinion Essay: The Role of Zoos

Nowadays, almost all top tourist city destinations host a zoo. However, their necessity has been the subject of continuing controversy since the first one opened its doors to the public. In my opinion, zoos are still necessary because people can have a closer look at wild animals and learn about them.

For some time now, the well-known mistreatment of zoo animals has led people to wonder about the necessity of these recreational parks, in spite of the protection they can offer to endangered species. In my opinion, wild animals are meant to be free and should live in the wild.

The necessity of zoos is a highly debated topic these days. Some believe these are places for education and animal protection, while others... Continue reading "The Necessity of Zoos: Balancing Conservation and Ethics" »

Cálculo de Subredes Clase C y Fundamentos de Sistemas Operativos

Classified in Spanish

Written on in English with a size of 7.77 KB

Ejercicios de Subredes Clase C

1. Subnetting con Máscara 240 (/28)

La máscara de subred 255.255.255.240 corresponde a /28 (4 bits de subred, 4 bits de host).

Representación binaria del último octeto: 11110000.

Tabla de Subredes /28 (Red 192.168.27.0)

Índice (Decimal)Bits de Subred | Bits de HostDirección de SubredPrimer Host UtilizableÚltimo Host UtilizableDirección de Broadcast
00000 | 0000192.168.27.0192.168.27.1192.168.27.14192.168.27.15
160001 | 0000192.168.27.16192.168.27.17192.168.27.30192.168.27.31
320010 | 0000192.168.27.32192.168.27.33192.168.27.46192.168.27.47
480011 | 0000192.168.27.48192.168.27.49192.168.27.62192.168.27.63
640100 | 0000192.168.27.64192.168.27.65192.168.27.78192.168.27.79
800101 | 0000192.168.27.80192.168.27.81192.168.
... Continue reading "Cálculo de Subredes Clase C y Fundamentos de Sistemas Operativos" »

The Impact of Tourism on the Environment and Economy

Classified in Geography

Written on in English with a size of 2.54 KB

Tourism

The tourism industry

Tourism is the temporary movement of people from their place of residence to another place in order to enjoy their free time. Tourism is therefore related to leisure. The development of the tourism industry involves creating the necessary transport and hospitality infrastructure to meet demand: airports, roads, accommodation, restaurants, etc. The main characteristic of the tourism industry is seasonal variation or seasonality.

Repercussions of tourism

It represents a significant source of revenue for a country. It creates jobs, but many of them are temporary, due to seasonality. It improves cultural relations between citizens of different countries. Destroys natural landscapes. In developing countries, the destination... Continue reading "The Impact of Tourism on the Environment and Economy" »

As2 ionic or covalent

Classified in Chemistry

Written on in English with a size of 1.16 KB

 Ionic bond-When a nonmetallic element reacts with a metallic element, electrons are transferred from the atoms of the metal to the atoms of the nonmetal, forming positive ions (cations) and negative ions (anions), respectively. Cations and anions are held together by the attractive forces among the oppositely charged ions. Covalent bond-the nonmetallic atoms share pairs of valence electrons in order to fill up their outer electron shell and gain stability. They can share one, two or even three pairs of electrons and atoms do not usually share the electrons equally. Covalent compounds form molecules.

A Guide to Catholic Virtues, Sins, and Commandments

Classified in Religion

Written on in English with a size of 2.73 KB

What is Virtue?

Virtue is an acquired habit and firm disposition to do good.

Theological Virtues:

  • Faith: Belief in God and all that He has revealed to us. It is a theological virtue by which we believe in God and all He has revealed to us.
  • Hope: Firm confidence in eternal life.
  • Charity: Love God above all things and all neighbors as ourselves.

Moral Virtues:

  • Prudence: Practical reason to discern in all moments.
  • Temperance: Moderates the attraction to sensual pleasures.
  • Justice: Consists in the constant and firm will to give to God and neighbor what is due to them.
  • Fortitude: Firmness and constancy in the practice of good.

The Seven Deadly Sins

The deadly sins, or capital vices, are those to which fallen human nature is mainly inclined. The deadly sins... Continue reading "A Guide to Catholic Virtues, Sins, and Commandments" »

The Influence of Ancient Greek Education, Architecture, and Sculpture

Classified in Arts and Humanities

Written on in English with a size of 2.58 KB

Growing Up in Ancient Greece

Education

- The purpose of education in ancient Greece was to raise good citizens. This meant that school was limited to boys only. Girls stayed at home and usually only learned to read and write if their mothers could teach them. School started at 7 years old. However, it was not free, so only wealthier boys could study until 18 years old.

Three Types of Schools

- Grammatistes: Reading, writing, and arithmetic.
- Kitharistes: Poetry and music.
- Paidotribes: Dancing and athletics; the training ground was called the gymnasium.

Architecture

There were three basic designs:
- The basic design, known as the Greeks, was based on a series of vertical columns with a horizontal beam across them.
- Doric Style: The most popular; the
... Continue reading "The Influence of Ancient Greek Education, Architecture, and Sculpture" »

Evolution of Soccer Balls: From Superball to Jabulani

Classified in Physics

Written on in English with a size of 2.57 KB

Good morning today we are going to present the evolution of soccer balls.


Superball

The superball was a soccer ball that consisted of a chamber composed of a valve that prevented the air from coming out and a seam from outside to inside that was invisible and without a flange. This ball was the first ball made without tiento


Invention of the Invisible Tiento

In Bell Ville, in the Argentine province of Córdoba between 1929 and 1931 Romano Polo, Antonio Tossolini and Juan Valbonessi conducted numerous tests and trials that culminated in the invention of the ball with an invisible tiento, a ball that continued to be used for a couple of years.


Professional Use and Commemoration

The superball was first used professionally in the same year of its invention... Continue reading "Evolution of Soccer Balls: From Superball to Jabulani" »