Humans are now also known as Homo sapiens. As the name suggests, Homo sapiens is a wise man. Homo sapiens is the only higher intelligent creature on the earth. We don’t know if there are any other intelligent life in the universe.
On earth, humans belong to mammals, primates, hominids and hominids. The closest animals to humans are orangutans, gorillas, chimpanzees and gibbons.
However, they are only human “cousins” and “cousins”, not “brothers”. Chimpanzees and gorillas belong to primitive people. Chimpanzees are not only primitive people, but also primitive people.
So chimpanzees are closest to humans. The genetic similarity between chimpanzees and humans is as high as 98.8%. However, humans and chimpanzees belong to two species, and this species is the last category in biological classification.
The same species can mate with each other to produce the next generation. For example, mules are produced after a donkey and a horse mate, and mules cannot produce the next generation. We think donkeys and horses are different species.
So, are there any human animals on earth that belong to the same species as humans? There is one in history! In a certain historical period, human beings are not the only “people” on the earth.
From two million years ago to 20000 years ago, there were at least six different kinds of people and animals. These different kinds of human animals lived together on the earth.
For a period of time, the earth is a white planet, especially in winter, most areas are covered by glaciers and ice. Why do you say so?
We are now in the interglacial stage of the Quaternary great ice age, which began 2.6 million years ago. A large glacial period can cycle alternately from several glacial and interglacial periods.
When the glaciers in the Antarctic and Arctic spread to the equator and covered most of the earth, it was an interglacial period and the glaciers retreated to the poles. Only areas near the South and north poles and higher parts of the earth are covered by glaciers.
We are now in outer space, observing the earth. The earth is a blue planet. If we look at the earth during the ice age, the earth is like a snowball. The Precambrian ice age (850 to 630 million years ago) is the coldest ice age on earth.
At that time, not only was the land covered by glaciers, but the ocean was completely frozen. It is called “Snowball Earth”. Of course, during most ice ages, the earth didn’t look like a snowball. It’s mostly white, it looks white, because there are green plants in low latitudes.
In fact, from about 2 million years ago to about 10000 years ago, there were at least six different kinds of people on earth. Our ancestors are just one of them.
In other words, at a certain point on the earth, there are different races. In addition, human evolution is not synchronous in the world, but has different development states. For example, some places may have become primitive people, and some places may still be ape people.
The earliest primitive people were able-bodied people, which appeared on the earth 2.9 million years ago at the latest. The earliest hominid fossils were more than 3 million years ago.
Therefore, human history can be traced back to 34 million years ago, that is to say, human ancestors experienced several ice ages. Our last ice age was the worm ice age, which began 110000 years ago and ended 12000 years ago.
At that time, the earth was much colder than it is now. The cold peaked 18000 years ago. However, such a cold climate has not led to the extinction of species other than human beings. It is the population bottleneck that leads to the extinction of species other than human beings.
Why did the Neanderthals, denisovs and heidelbergers die out? In fact, it is related to a huge volcanic eruption more than 70000 years ago.
There are eight volcanoes on the earth. These eight volcanoes are also called super volcanoes. The eruption frequency of eight volcanoes is more than 10000 years at least. The history of human civilization is only 5000 years old.
In other words, in the history of human civilization, there has never been a super volcano eruption. The latest super volcano eruption was the taopo Lake volcano 26500 years ago. Once the super volcano erupts, it will change the global climate and form a global disaster.
All living things on earth will face a serious threat. For example, Yellowstone is a super volcano. Once Yellowstone erupts, volcanic ash will cover 75% of the territory of the United States. After the volcanic ash that blocks the sun enters the atmosphere, the sun does not reach the ground.
The global average temperature will drop by at least 10 ℃, and even the equator will snow. Continuous low temperature will make green plants unable to carry out photosynthesis. Once the green plants die on a large scale, the animals will also die because they can’t get food.
Climate change and the reduction of the number of races are the main reasons for the extinction of Neanderthals, and the activities of Homo sapiens have played a role in promoting the adverse effects.
Even if Homo sapiens compete with Neanderthals, if the number of Neanderthals is large enough, they will not be extinct, because human technology was primitive 20000 years ago, and Homo sapiens is the most common human species in terms of physique. The bones and muscles of Neanderthals are actually stronger than those of humans.
On today’s earth, not only other species other than human beings have been extinct, but also chimpanzees, gorillas and chimpanzees, as human species, have become rare animals and are on the verge of extinction. These animals need human protection.