Is it true that modern humans were formed about three or four million years ago?

Yes, since the discovery of the fossil of Australopithecus Lucy in Africa, it has been identified as a forming man, who lived three or four million years ago.

Declared a World Heritage Site in 1999, the Cradle of Humanity site is located in a tranquil valley west of Johannesburg and is home to about half of the world's fossils, providing important clues to the origins of humans. "Cradle of Mankind" is the general term for a series of archaeological sites, the most famous and important of which is the Steckfontaine Caves.

There are three world-famous human ancestor fossils unearthed at the "Cradle of Man" site in South Africa: the first is the fossil of Australopithecus "Little Feet" unearthed in 1997 and about 3.3 million years old. It is known to be the oldest human ancestor skeleton in the world today.

The second is the fossil skull of "Mrs. Price" unearthed in 1947, which is between 2.6 million and 2.8 million years old. It is the first complete fossilized skull of an African species of Australopithecus australopithecus. The third is the fossil skull of the "Towne Child" Australopithecus unearthed in 1924, which is about 2 million years old.

The "Little Feet" fossil and the "Lady Price" skull fossil were both found in the Steckfontaine Cave.

The Steckfontaine Cave is a karst cave developed in the dolomite, which is divided into two parts: above ground and underground. The aboveground part of the cave was eroded after the collapse of the original cave top, and the underground part has a dark river and a branch cave. Paleoanthropologists and archaeologists speculate that human ancestors first appeared here and then migrated around the world.

As the world's richest and oldest site of Australopithecus fossils, the Steck Fontaine Cave has excavated more than 600 homininaceous fossils, more than 9,000 stone tools and rich animal fossils. Among them, the "little foot" fossil is one of the most important discoveries in paleoanthropology at the end of the 20th century, which caused a sensation all over the world. In order to facilitate protection, the "little foot" fossil has not been fully excavated so far, and it is still preserved in the rock wall of the cave.

At present, the excavation of the aboveground part of the Steckfontaine Cave is still ongoing.

The Maropon Exhibition Hall, built next to the archaeological site of the "Cradle of Mankind", is the historical center and exhibition center of the "Cradle of Mankind" site. "Maropong" is a local Setswana language that means "return to the place of origin". There are originals and replicas of various types of fossils on display.

The highest part of the exhibition hall is 20 meters above the ground, and the widest part is 35 meters. The entrance is designed in the shape of an ancient tomb, and the exit is a modern building. The exhibition hall uses modern science and technology, sound and light and other comprehensive means to mobilize the multiple senses of the human body to feel the history of human birth, evolution and development.

The logo of the Maropong Exhibition Hall is a pair of striking footprints, and its background is the earth dominated by Africa, which is taken from the origin of human ancestors to the world from the "cradle of mankind". It is reported that the "Cradle of Mankind" site currently receives about 3,000 visitors per day.

The world's earliest ape-man fossil was discovered in 1891 on the island of Java, Indonesia, 60 to 800,000 years ago. The Javanese ape-man, together with the Peking man discovered in Zhoukoudian, China, in 1927, was once recognized as the "earliest" human in the world. At that time, it was believed that the history of mankind was no more than 100,000 years old, and the first human beings appeared in Asia.

The Shandong Yiyuan ape man, discovered in China in 1981, belongs to the same era as the Beijing ape-man. However, this theory of the earliest origin of human beings has been overturned by two archaeological imitation discoveries in China. After the liberation, archaeologists successively found ape-man fossils in Lantian in Shaanxi Province and Yuanmou in Yunnan Province.

The Lantian ape-man is 1 million years old, and the Yuanmou ape-man is 1.7 million years old.

So, how long is human history? In the last two or three decades, archaeologists have discovered many ape-man fossils on the African continent, giving us a new understanding of human history. In 1959, an almost complete fossilized ape-man skull and labor tools were found in Tanzania, dated to 1.75 million years ago.

In 1972, fossilized ape-man skulls, leg bones and stone tools were discovered in Kenya and dated to 2.6 million years ago. In 1973, it was reported that ape-man fossils were found in Ethiopia about 3 million years ago or 3 million years ago. From this point of view, human history is not 800,000 years, nor 1.7 million years, but more than 3 million years.

At present, the site excavated in China is the Wushan Man 2.3 million years ago.

The earliest apes appeared around the late Oligocene of the Cenozoic Tertiary (30 million years ago), which may have been the common ancestor of humans and modern ape-man. In the late Cenozoic Era (3 million to 12 million years ago), the topography and climate change in East Africa and South Asia gradually reduced the forest area, and glades and savannas appeared, forcing Australopithecus to often forage for food on the ground and gradually become accustomed to walking with foot intelligence, thus forming a transition stage from ape to human. Anthropology calls them "people in the making."

About 50,000 years ago, when Homo sapiens was formed in the late period, the human race or race also began to form.

Throughout the excavation, the researchers carefully surveyed the stratigraphic sequence of the area where the human fossils were unearthed, and determined that the human and animal fossils were undisturbed after they were buried. During the excavation, the researchers systematically collected dating samples and dated the stratigraphic and fossil samples using the 230th-234U unbalanced uranium method and the AMS carbon-14 method, respectively. Uranium dating results show that human fossils were buried 80,120,000 years ago.

The AMS carbon-14 test results and fauna composition of the fossil samples show the characteristics of the early Late Pleistocene, which further supports the uranium dating results. Based on this, it can be determined that fully modern humans appeared in parts of South China at least 80,000 years ago.

According to the fact that modern humans appeared 50,000 years ago, considering that there were no population restrictions, short life expectancy, a young population structure and a high fertility rate.

Each mother will have about 6 to 8 children, the population of the United States.

According to the scholar Carl Haub, before the advent of agriculture, the world's population was only about 5 million to 10 million people who lived by hunting. By the 1st century AD, according to the intermittent censuses of Rome, China, and the Mediterranean at the time, the world's population.

It has grown to 300 million. A high birth rate can be used to estimate that about 106 billion people have lived on the planet to date. There are 6.1 billion people on our planet today, which is the total number of people who have ever lived on the planet.

In 1900, there were only 1.6 billion people in the world, but developing countries.

Rapid population growth has led to a surge in the world's population, so the proportion of the planet's population that we have now is rising. As of November 2011, the world's population has reached 7 billion, about 6% of all people who have lived on Earth, and it is estimated that there are about 116.7 billion people who have lived on Earth. Author:

Chen Datou.

7 million years ago.

In 1910, the first fossil of Rama Australopithecus was discovered in the West Varik Mountains on the border between Pakistan and India, and it was a fragment of the maxilla. In 1934, it was named Ramaucus. In the sixties and seventies, fossils of Australopithecus were found in Kenya, Greece, Turkey, Hungary, Pakistan and Yunnan Province of China.

Ramaucus has been identified as having lived between 14 million and 8 million years ago. Archaeologists have theorized that Ramapicus was initially able to walk upright on two legs, lived in forest clearings or forest fringes, and ate mainly plant fruits, but may also have eaten a little meat. It is the earliest human found in the world.

Three or four million years.

At present, most anthropologists believe that modern humans developed from a branch of Australopithecus africanus, which belonged to the "forming man", which finally formed about three to four million years ago after a long period of evolution and labor.

Early ape-man was the earliest fully formed man, the initial stage of human development, and its survival was difficult to survive from 3.8 million to 1.8 million years ago. The earliest known ape-man fossils were found in Tanzania between 1974 and 1075, mainly from the upper and lower jaws and teeth, dating from 3.77 million to 3.59 million years ago.

Origin of Humans: After the end of the transition from ape to man, the physical form of humans continued to develop.

Over a long period of time, people divided this development process into three stages: ape-man, ancient, and new-man. Due to the continuous enrichment of fossil materials and the deepening of people's understanding, this staging method is no longer suitable, and foreign scholars mainly use two staging methods to dismantle blind plums.

First, it is divided into three stages: Australopithecus, Homo erectus, and Homo sapiens; Homo sapiens is further divided into early Homo sapiens and modern Homo sapiens. The disadvantage of this division is that it puts Australopithecus australopithecus who cannot make tools and Homo 1470 who can make tools in the same category. The other is divided into 4 stages: the earliest humans (or the earliest genus Homo), Homo erectus, early Homo sapiens, and modern Homo sapiens.

Chinese scholars have also proposed four stages of division, namely early ape-man, late ape-man (Homo erectus), early Homo sapiens, and late Homo sapiens. The "early ape-man" stage is equivalent to the "earliest human (human genus)" stage proposed by foreign scholars. Although not many pre-Homo erectus fossil materials have been found, it is still appropriate to list it as a separate stage to distinguish it from Australopithecus and Homo erectus.

Anthropologists, archaeologists, historians, biologists, chemists, and even philosophers and religionists have studied the origin of human beings from various angles, but no one has been able to explain it so far.

There are many myths and legends about the origin of mankind among various peoples, and some of them coincide, but of course there are differences, in these myths. Summarizing the various myths, the origin of human beings can be divided into five types: "called out", "originally existed", "plant evolution", "animal evolution", and "created by dust".

About 5,000 years ago, there was a good key in human history.

a.Urban Revolution.

b.Religious Revolution.

c.The Agricultural Revolution.

d.Industrial leather shines.

Correct Answer: a