Human beings have experienced millions of years from their emergence to continuous evolution. From anthropoid to primitive humans, and then to modern humans, the history of human development is a long process .
Generally speaking, human beings have appeared on the earth for a long time, but compared with the long history of the earth, the history of human beings is only a very small part of it.
Theory of evolution
Tips: Scientists estimate that humans diverged from their common ancestor with chimpanzee between 5 million and 7 million years ago. Several species and subspecies of the genus Homo later developed have gone extinct. These include Homo erectus, which inhabits Asia, and Neanderthals, which inhabit Europe. The ancient Homo sapiens (early Homo sapiens) evolved from about 250,000 to 400,000 years ago.
The mystery of the earth has not been understood until now. No one knows how long the earth has revolved around the sun. Before the emergence of human beings, many lives have appeared on the earth, and there are many extinct species, such as dinosaurs.
For the origin of all life on the earth, until now we have no definite answer.
The evolution of life on earth
We have too many doubts about the history of the development of the earth, and the same is true for the history of human development, such as what is the origin of mankind? How did the first man or woman come from? How gender is formed and so on.
We have no way of knowing these. These questions are like asking whether the chicken comes first or the egg comes first. Obviously there is a reasonable answer, but we can't find an accurate answer. Let us analyze and analyze together today.
The birth of life on earth
Many life forms have been born on the earth before mankind, so how did these life be born?
In fact, this question has always existed in human minds. From Darwin 's theory of evolution to the current popular theory of the big bang, what about ? Let’s take a look at some of the most influential claims.
first is cosmic embryo seed theory .
This means that the first life form on the earth originated from space. The collision between the earth and other celestial bodies caused some microbes on meteorites to enter the earth. This is the origin of the birth of life on earth.
Comet carrying microorganisms to the earth Think: there are microorganisms in the universe,These microorganisms act as spores of species, driven by the pressure of sunlight, and are sent to the far side of the universe. If they encounter a planet like the earth, they will spread life there.
The second type is deep sea chimney theory .
This theory believes that life originated from the vent of the submarine hot spring of , from which the first organic particles rich in hydrogen erupted. Then, these organic particles are gathered together in the rock depressions by the hot springs and provide them with rich mineral-like ingredients.
Even now, these seabed hot springs are still rich in chemicals and heat, nourishing a vibrant ecosystem.
Deep sea chimney theory
The last and most recent statement. In the past, it was generally believed that when meteorites in outer space carried phosphorus, an important material for life, came to the earth, and the earth began to evolve species.
However, new research believes that the frequent lightning strikes in the early earth stimulated the phosphorus that originally existed on the earth, and its substance was sufficient to support the development of early life on the earth.
published on March 16 in the "Nature Communications" a study showed that the early Earth had about 5 billion lightning times a year (now about 560 million times a year), the lead researcher Hess said that the earth The amount of phosphorus stimulated by lightning strikes 3.5 billion years ago has long surpassed the amount of meteorites, so lightning strikes may be the main cause of the origin of life on earth.
Tips: Hess and his mentors are working on a particularly large sample of primitive lightning lava, which is a rock produced when lightning strikes the ground. Researchers at the University of Leeds were initially interested in how lightning lava was formed, but they were fascinated by the discovery of a large number of extremely unusual phosphorus minerals called schreibersite in the samples of Glen Alling. Phosphorus is a necessity of life and plays a key role in all life processes from movement to growth and reproduction.
In addition, there are many theories, but most of these are just inferences, and there is still no strong evidence to prove which is the truth of the birth of life.
With the advancement of science, I believe that the veil of mystery will be opened step by step.
The birth and evolution of mankind
The development history of the earth is too long, and the origin of life is too far away from us, but as human beings, we must find our own source.
There are many sayings about the birth of human beings, such as the doctrine of creation.
Adam and Eve
In the Western theory of creation, the first human beings were created by God. God first created Adam and then created Eve with a rib of Adam. span3span, let them live in the Garden of Eden.
is bewitched by a viper, Eve and Adam taste the forbidden fruit ,Being demoted to the world by God, human reproduction began.
Nuwa and Fuxi
Tips: According to legend, the chaos has begun, and the land is full of mountains, rivers, seas, flowers, trees, birds, beasts, fish and insects and their evil spirits. There are no human beings. The Jade Emperor said to his left and right waiter, the Golden Boy and Jade Girl, who is also the son and daughter of the Dragon King, , Fuxi and Nuwa: “Between heaven and earth, there should have been gods, celestial spirits, humans, animals, hungry ghosts, hell, etc., for the transformation of the six realms .However, there are only five realms between heaven and earth, such as gods, celestial spirits, animals, hungry ghosts, and hell. There is no way of mankind. Therefore, the sentient beings between heaven and earth cannot be transformed in reincarnation. You descend into heaven and earth, Marry there and become pros and multiply humans!"
In Chinese mythology, Pangu pioneered the world. The god Nuwa used clay to squeeze out men and women. There is also a saying that is Nuwa and Fuxi. was the earliest man and woman, and gave birth to later humans.
Although these ancient legends have explained the birth of mankind and the appearance of men and women, they are myths after all, and they are definitely not tenable in this age of advocating science. It was not until Darwin proposed the biological evolution theory that it opened up a new continent for people to explore the origin of mankind.
It is known from the theory of evolution that all species on the earth do not appear independently and have evolved to this day, but in the past we all had a common ancestor.With the mutation of genes and the choice of environment, the biological population has been divided and gradually changed to the state it is today.
According to the theory of evolution, we can learn that we and chimpanzees were the same ancestor millions of years ago.
About 4.5 million years ago, due to changes in the climate and environment of the continent, the original dense forests were degraded and transitioned to grasslands. The pressure on life in the woods continued to increase. .
During this process, the apes' arms gradually shortened and began to walk upright. In order to better cope with the hot environment, the hair gradually faded, leaving only a small amount of hair, such as hair and armpit hair. After millions of years of long evolution, anthropoid apes continue to transform into humans
But when the great apes transformed into humans, there were already many mammals on the earth, and sexual reproduction _strong7 span _strong7 .
has also become male and female in great apes,So when humans began to appear, men and women were synchronized, and they all evolved from male and female great apes.
asexual reproduction and sexual reproduction
From the theory of evolution, we can know that natural selection, survival of the fittest, species are constantly evolving.
The source of the problem of whether humans had males or existing females can also be attributed to gender problems. Only when there is a gender distinction at the beginning, can this situation be maintained in the process of continuous evolution.
The emergence of gender is inseparable from the emergence of sexual reproduction .
About 1.2 billion years ago, there was no macroscopic life on the earth, but more single-cell and multi-cell life living in water. Because of the single structure of these life forms, there are no fossil remains such as bones. It also left many problems for our scientific research.
But it’s not difficult to know that most of these simple life forms at that time used asexual reproduction _strong7 span _strong7 span.To put it simply, it is the division and replication of cells, . This method of reproduction is simple and fast, but all new individuals are the same as the original, which shows that there is no gender.
The earliest species discovered by humans to start mating is the small-legged fish 380 million years ago. This fish has a very obvious male and female state. When mating, it will standing side by side and holding hands. Ring hand .
Tips: The external genitalia of male small-limbed fish extend to the side, almost 90 degrees to the body. Due to the presence of rigid bones, their mobility must be poor. Because they are wearing a thick bone shell, it is difficult for small-limbed fish to entangle together like snakes to complete mating. Based on this, scientists speculate on their mating process: male and female fish line up side by side, with jointed hard pectoral fins. Crossing each other is like dancing a "dance of love" and hugging each other. Finally, the male fish will extend the external genitalia protruding to the side under the female fish's body, which is held by the female fish with a bone plate to complete the in vivo fertilization process.
This is the earliest vertebrate that humans currently mate with. The emergence of sexual reproduction means that there have been gender distinctions 380 million years ago or even earlier. Of course, this does not mean that this is the earliest sexual reproduction species on the planet .
It is mentioned in many of our theories that there were no terrestrial organisms on the earth hundreds of millions of years ago. All life forms live in the ocean, and the earliest visible reproduction is also destined to appear in the ocean. The distinction between men and women in humans may really have evolved from marine species and emerged simultaneously.
Is there a male or an existing female?
The first sexual reproduction discovered in the world today was in the ocean 380 million years ago, when sexual reproduction in the ocean had already appeared.
These marine organisms already have gender distinctions when they migrate to land, so most of the male and female life forms on land can be said to have evolved synchronously .
Tips: To get from the water to the ground requires more than just water. The fossil record in the picture above shows a series of changes in the gradual transformation of aquatic organisms into terrestrial organisms. Their fragile fins become bony, strong limbs that can walk on land. The gills evolved into the lungs, making it possible to breathe air. The long and flexible neck allows these creatures to look down and see the food on the ground under their feet, making it easier to survive. This difficult transition took about 30 million years.
Human beings do not exist first male or female first, but directly from other male and female species step by step, men and women also appear simultaneously .
We have to understand that the small-leg fish does not represent the emergence of sexual reproduction. It is only the first creature that we have discovered that sexual reproduction and gender appear. However, does not mean that this is the first place on earth. A creature that reproduces sexually .
380 million-year-old small limb fish
So if you want to know the beginning of the distinction between men and women of all species on the earth, you have to go to an earlier and earlier time for a long period of time.
Explore can get the real answer.
The life of the earth has appeared for billions of years, but before the asexual reproduction of most organisms, the genes of new individuals were exactly the same as the original ones, which is not conducive to biological evolution and changes to the environment. Life on the earth has not changed in billions of years .
Life on earth at that time has always been maintained a simple, low-level form .
The evolution of life on earth
But the emergence of sexual reproduction has changed this situation.Although this method of reproduction is cumbersome and slows down, the genes of the offspring of will change , increasing the diversity of , which also speeds up the evolution of life.
is like the survival of the fittest. At that time, some marine life evolved under the pressure of the environment before sexual reproduction appeared. The problem of the first man and woman should not be limited to human beings, but should be included in all life. The emergence of the first male and female bodies can even be traced back to multicellular life bodies more than a billion years ago.
Tips: In 1990, a fossil of red algae was discovered in the Canadian Arctic. This red algae is the first known sexually reproducing species on earth, and is also considered to be the oldest ancestor of modern plants and animals that have been discovered.
and human beings have discovered that the earliest "sex" creature is , a red algae 1.2 billion years ago , but at this time is the earliest gendered creature on earth? Was the first sexual reproduction in the world? We have no way of knowing now.
Summary
is nothing to blame,It is the emergence of gender and the emergence of sexual reproduction that make the world more and more exciting. Gender appears in the ocean and develops on the land. If we have to say that there is a male or a female first, I think it cannot be fully confirmed by the current research results.
After all, the evolution of no species is single, and it is often grouped. Perhaps it is a difference that has occurred in a certain evolutionary process, and there is a gender distinction.
If we are only exploring the evolution from apes to humans, whether there is a male or a female first, we can clearly know that they appear at the same time. But mentioned earlier, we can say that the first "man" and "woman" of are multicellular life from the ocean.
The question of men and women is the same as the question of whether there is a chicken or an egg. It is not so much who comes first, but it is all due to the evolution of the .
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