You feel synchronized because the people who survive are the same people who survive—modern humans (biological classification).
All are between tens of thousands and three hundred thousand, the descendants of the same ethnic group, of course, the physiological structure is exactly the same.
All human beings in existence belong to late Homo sapiens, and late Homo sapiens has another name - modern man in the anatomic sense.
So, what about everyone else?
Of course they are all extinct.
It can also be said that some are not extinct, because in fact, from the perspective of taxonomy, human families include orangutans, gorillas, chimpanzees, and bonobos, and the difference between humans and chimpanzees is not greater than the difference between different species of cats.
From a species point of view, humans and chimpanzees are typical "cousins". Actual chimpanzees are not just human, but also humanoid (biological classification). Of course, in the secular values of man, chimpanzees and the like are not regarded as human beings. The earliest Terrans were the Chadian Shakhs, 7 million years ago, and the common ancestor of humans and chimpanzees.
Further ahead, around 18 to 20 million years ago, the Tibetan Plateau rose to a certain height, blocking the monsoon, and Africa became more and more arid. Coupled with the influence of the Great Rift Valley in East Africa, some of the early monkeys that lived mainly in trees had to go to the ground, and their lower limbs became more developed.
So the division of the ape family, the apes of this period, also known as the forest ape. A vigorous forelimb that evolved towards the gibbon family. One continues to strengthen the lower limbs and evolve towards the human family. The upper limbs of gibbons are extremely competitive in the tall jungle, which dooms the human family to go further to the edge of the forest.
Around 12 million to 16 million years ago, orangutan subfamily (e.g., orangutans) branched out, and they were vegetarian or occasionally invertebrates, occupying ecological niches along forest boundaries. The other is closer to the African savannah. They are the human subfamily, although they are occasionally active in the jungle, but have often appeared on the forest border, and have collective hunting behavior, typical omnivorous. The other family, on the other hand, evolved a more powerful omnivorous behavior in barren land. Chimpanzees still retain their habit of preying on monkeys.
About 6 to 8 million years ago, human ancestors divided into gorillas and chimpanzees. Human cousins also occupy the forest's ecological niche almost entirely. In a sense, we may be out of the forest on our own, or we may be in the forest but not able to compete with chimpanzees. Because after the lower limbs are further strengthened, the competitiveness in the forest will be reduced.
7 million years later, the Chadian Shah (Terran) divided into the genus Millennium, the genus Ape, and the genus Australopithecus. By the time Australopithecus appeared, it was more than 3 million years ago. After 4 million years of evolution, the human ancestors only now had enough adaptability in the grasslands, and the body structure was more adapted to upright walking and hunting.
With the rapid increase in brain capacity and enough adaptation to the environment, it is natural to usher in a population outbreak. Australopithecus brain capacity is 450 to 530ml, while the size of the monkey brain hole is only 200 to 300ml, almost doubled. As australopithecus expands, the emergence of different populations is a natural occurrence. However, the active area is too large, which inevitably produces physical isolation, which forms reproductive isolation, so Australopithecus evolved different species. For example, Australopithecus Alpha, South Antelope, Australopithecus Africanus, Australopithecus marvel...
At the same time, Australopithecus has evolved new human genera, Psychic genus and Kenren genus. Some scholars believe that the Prong belongs to a species of Australopithecus, called stout Australopithecus. Of course, the evolutionary relationship of these ancient apes is only the speculation of some anthropologists. There is also a certain possibility that it is only a cousin species that have been extinct sequentially and have no evolutionary relationship.
In general, unlike what ordinary people understand, human distant ancestors have evolved rich populations and even populations as early as australopithecus, because of the expansion of the active area.
The main reason is that the basic biology teaching knowledge system of Chinese middle school students is very backward (or oversimplified), and the main content is still the knowledge system of decades ago. Under these knowledge systems, the human evolutionary tree is very simple. For example, in 1960, people saw that the forest ape evolved into Australopithecus australopithecus, australopithecus evolved into Homo erectus, and then evolved into Homo sapiens.
However, when humans evolved the genus Of Mortals, Earth suddenly opened up in hell mode.
The Quaternary ice age appeared. Africa's environment has become more harsh, not only arid, but also getting colder and colder, with less and less food. A large number of humans and animals went extinct during this period. It should be known that the height of Australopithecus is more than one meter, and the height of the Homo erectus-dominated true genus generally reaches 1.5m, and it grows nearly half a body tall.
When the public looks at the history of biological evolution, they always talk about this and what has evolved. But the essence is only the survival of the mutation, and all those without mutation are erased by nature. The volume of the Erectus brain has reached 1,000ml, which is already twice that of Australopithecus.
Homo erectus existed at almost the same time as Australopithecus, and the span from archaic apes to Homo erectus was much shorter than that of Chad Shahe to Australopithecus. Here we can see a very cruel fact: short ancient ape people, as well as those who are not intelligent enough, are almost all extinct under the cruel nature.
It is precisely because of the fierce competition that Homo erectus has probably traveled to most parts of the world (the so-called first out of Africa). However, in addition to the cold, the African climate at that time was still experiencing cyclical fluctuations. In a period of 200,000 years, there have been five or six changes from forests to grasslands. The harsh climate has forced human beings to travel to different continents, but there has also been geopolitical isolation, giving birth to more and more human races.
For example, nominees, tree dwellers, ludo wives, craftsmen, homo erectus, and so on. Earlier, paleoanthropology studies tended to crudely divide human evolution into three cascading stages: ape man (Homo erectus) → ancient man (early Homo sapiens) → new man (late Homo sapiens). But in reality, human evolution is far more complicated than this relationship.
Homo erectus came out of Africa 1.8 million years ago, while modern man came out of Africa 200,000 years ago, and Homo erectus and modern humans are two completely different human beings. Both groups of humans evolved a rich subspecies. At least 1.8 million years ago, our ancient human brothers began to be distributed all over the world.
The craftsmen's branch evolved successively from pioneers, Heidelbergians, Rhodesians, Elder Homo sapiens, and all the way to modern humans, the so-called late Homo sapiens. Among modern people, there are Omo people, Coroma farmers, mountain cave people, Liujiang people and so on. One of the Heidelbergians evolved into Neanderthals. The human race mentioned above is only the tip of the iceberg of the ancient humans found, and the fossils of ancient humans discovered by humans may only be the tip of the iceberg in the history of human evolution.
The evolution of Homo sapiens actually began 1.2 million years ago, and it was only 400,000 years ago that it parted ways with neanderthal ancestors. Modern humans and Neanderthals who came out of Africa 70,000 years ago had brief genetic exchanges. So in the genes of modern humans other than Africa, there are 1%-4% Neanderthal genes. The modern human beings who have evolved are no less capable of surviving than the most powerful.
Some races have become extinct on their own, while others have been wiped out by modern humans. Human beings have a very strong war attribute, which may be more than 1 million years ago, and the cruel competition has been engraved in the genes. As victors, in addition to some of them being naturally extinct, it is very likely that many human races were buried (or even eaten) by our own hands.
Not only Neanderthals, but also the Omo people, The Coromanians, the Cavemen on the Top of the Mountain, and the Liujiang people planted by modern humans were all extinct. All the humanoids, and finally only modern humans (biological classifications), can the internal structure be out of sync? 200,000 years ago, we had a common mitochondrial ancestor "Eve".
60,000 years ago, we had a common Y chromosome ancestor "Adam". Our ancestors came from the same population as Eve, and all other groups eventually went extinct.
But in the 140,000 years between "Eve" and "Adam", of course, there will be new breeds with reproductive isolation from us, but they are all extinct. In fact, in the history of biological evolution, elimination is the norm, we are only "special cases".
The American Journal of Human Genetics once reported that 70,000 years ago, the population was even as low as 2,000. Yes, humans are also close to extinction. After thousands of years of washing, the sand will always be about the same.
Is the sand made of the pebbles around you?
Of course not, they all originated together from rocks on the seashore hundreds of millions of years ago. Treating monkeys (monkeys) as ancestors is tantamount to patting the nephews around them and calling out to their fathers. Monkeys have faster generations than humans, and the surviving monkeys, even all orangutans and chimpanzees, are clearly the descendants of humans.