Question

Простейшие эра период время появления, ребят помогите пожалуйста!

Answer 1

Все зависит от того, кого считает «простейшим» Ваш педагог.  

Если «клетки без ядра», они сформировались свыше четырех миллиардов лет назад.  

Если свободноживущие «клетки с ядром» (старое название «одноклеточные организмы»), то они появились примерно 2 миллиарда лет назад, во времена так называемого «кислородного взрыва». Когда в атмосфере Земли, за 200-250 миллионов лет, накопилось более 20% свободного кислорода (что, собственно, и привело к формированию клеточного ядра).  

А отпечатки первых многоклеточных пленок и комков (тоже, ведь, простейшие) встречаются в горних породах возрастом не более 900 миллионов лет.    

Answer 2

The Eras and Periods of Time

The concept of eras and periods of time is used to categorize and understand different stages of history. These divisions help us organize and study the past, allowing us to analyze and compare different periods based on their characteristics, events, and developments.

Eras refer to long periods of time characterized by significant changes or shifts in various aspects of human civilization. Eras are often defined by major historical events, cultural shifts, technological advancements, or political changes. Some well-known eras include the Stone Age, Bronze Age, Iron Age, Middle Ages, Renaissance, Industrial Revolution, and Modern Era.

Periods are subdivisions within eras that further categorize and specify different stages or phases of history. Periods are usually defined by specific criteria, such as the dominant culture, political systems, or technological advancements of the time. For example, within the Middle Ages, we have periods like the Early Middle Ages, High Middle Ages, and Late Middle Ages.

It's important to note that the classification of eras and periods can vary depending on the region or field of study. Different cultures and disciplines may have their own unique ways of categorizing and naming these divisions.

Now, let's take a closer look at some specific eras and periods:

1. Stone Age: This era refers to the prehistoric period when early humans used stone tools and weapons. It is divided into three periods: the Paleolithic (Old Stone Age), Mesolithic (Middle Stone Age), and Neolithic (New Stone Age).

2. Bronze Age: This era marked the widespread use of bronze, an alloy of copper and tin, for tools, weapons, and other artifacts. The Bronze Age is characterized by the development of complex societies and the rise of early civilizations. It is followed by the Iron Age.

3. Middle Ages: This era, also known as the Medieval Period, spanned from the 5th to the 15th century. It is divided into three main periods: the Early Middle Ages, High Middle Ages, and Late Middle Ages. The Middle Ages saw the decline of the Roman Empire, the rise of feudalism, the spread of Christianity, and significant cultural and intellectual developments.

4. Renaissance: This period, which emerged in Europe during the 14th to 17th centuries, marked a renewed interest in art, literature, science, and humanism. It is often considered a bridge between the Middle Ages and the Modern Era, characterized by a focus on individualism, secularism, and the revival of classical knowledge and culture.

5. Industrial Revolution: This era, which began in the late 18th century, witnessed a significant shift from agrarian and handcrafted economies to industrialized and mechanized production. It brought about profound changes in agriculture, manufacturing, transportation, and social structures, leading to the rise of modern capitalism and urbanization.

These are just a few examples of eras and periods throughout history. Each era and period has its own unique characteristics, events, and developments that shape our understanding of the past. By studying these divisions, we can gain insights into the progression of human civilization and the factors that have shaped our world today.

I hope this provides a helpful overview of eras and periods of time. If you have any more specific questions or need further information, feel free to ask!