What is the origin of humanity? And how do you overcome the difficulties of moving from the sea to t

The origin of human beings comes from the ocean, all living things are inseparable from water, and with the continuous change of the natural environment, marine life began to move to the land and evolved into the current life.

It is highly likely that the earliest ancestors of humans were 300 million years ago, the haynatl, one of the earliest tetrapods. The newt spends most of its time in comfortable water, but it is very bulky on land, and its limbs evolved from the fleshy, paddle-like fins of fish. It took humans about 30 million years to develop a physical plan suitable for walking on land.

It is likely that the ancestors of humans were marine creatures, and in fact it took humans 30 million years to walk on land.

Episode 1 What exactly is the origin of humanity.

Plants or animals? The difficulties they have to overcome are different.

Plants have the following difficulties:

Acquisition of water and minerals. Evolved into roots through the holders (false roots) of algae, which obtain water and minerals from the soil.

The upright of the plant. Through the differentiation of rhizomes and leaves, a cellulose-based support structure has evolved in the stem (also in roots and leaves), so that the plant is upright and upward. Vascular bundles evolved internally to transport water, minerals, and nutrients.

Stay hydrated. The main purpose is to prevent the evaporation of water in the stem and leaves, first, the epidermal layer thickens, and the outer layer of the stem is composed of dead cells that have lost their activity to prevent the transport of water to the outside; The second is to form a waterproof wax layer on the surface of young stems and leaves to prevent water transport.

Leave the water for reproduction. There is a waterproof layer on the surface of the spores and seeds, which can prevent the internal water from being dispersed and lost; Most sporophytes still need water for their gametophyte spores, so sporophytes are a transitional type from aquatic to terrestrial. Seed plants reproduce for both sexes, with the help of air (wind vectors) or other animals (insect vectors) to combine germ cells of the sexes to produce seeds.

Animals have the following difficulties.

Breathe away from the water. The gills evolved into lungs, which breathe air directly. Some species (amphibians) can directly exchange gases through moist ** to assist respiration.

Leave the movement of the water. Both the inner and outer skeletons are strengthened to support the body in the force of gravity on land; The flippers evolved into walking limbs with bendable joints for locomotion on land.

Stay hydrated. With the exception of amphibians, other terrestrial animals have evolved waterproof epidermis, and some have evolved scales that cover their entire body to prevent water from evaporating. Amphibians can only live in the shade near the water in order to keep their epidermis moist.

Leave the water for reproduction. With the exception of amphibians, all evolved in vivo (mating behavior, fertilizing eggs with the help of body fluids; A waterproof shell has evolved on the outside of the egg to prevent the water from evaporating from the egg, or the fertilized egg is left in the body to develop and produce larvae directly. Some animals lay their eggs underground or inside other plants and animals.

Amphibians still maintain aquatic reproduction, which is the transitional type from aquatic animals to terrestrial animals.

During the early reformers of the earth, all places were about the same height, and there was no clear distinction between the land and the sea. And because the early Earth was hot, it had only a thin shell, and on top of this shell was a layer of water that covered the whole world. Then, over time, the Earth continues to cool, causing some degree of contraction.

As a result, the surface of the earth appears uneven, which is like a shrunken apple with uneven folds. Shrinkage also cracks in an otherwise fragile shell. As a result, molten magma from the Earth's interior gushes out along the cracks.

Over time, these eruptions pile up higher and higher, eventually becoming volcanic islands suspended above the pristine ocean. Based on the distribution of the oldest known rocks, the land islands may have been found in what is now Western Australia, western Greenland, and southern Africa.

<> when plate movements occur, land masses drift and collide as one, just as the Indian subcontinent does with the Asian continent. Conversely, some continents broke up and drifted into what they are today, such as Africa and South America. It should be noted that the above view of continental formation is not the only theory used to explain the origin of continents.

With the development of human space exploration activities, people have gained many new revelations from the material phenomena of other celestial bodies, especially from the huge craters that exist widely in cosmic celestial bodies, some researchers believe that perhaps the formation of sea and land is not as previously said, the ocean is primitive, and the land is later; It is more likely that the continents already existed, and the oceans developed from impact craters formed by huge meteorites.

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In the early days of the earth's late sphere, the highest part of the earth's crust that was not submerged in the process of ocean formation was the continent. The continent has been in a stable state since the birth of the earth. The transformation of the ocean into land is due to the movement of the earth's crust.

It is all the deep evolution of minerals, rocks, and organisms that has made the Earth what it is. Use science to make late learning to argue.

The reason why the earth can evolve into continents is mainly formed by volcanic eruptions on the ocean floor and the mutual compression between the earth's crust.

Because the material in the earth's interior is always in constant motion, the hollowing out of the earth causes the earth's crust to change, sometimes rising, sometimes falling. The water near the edge of the continent is relatively shallow, and if the earth's crust rises, the seabed will be exposed and become land. On the other hand, if the land on the seashore sinks, the prudential track will become the ocean wide and scattered.

This change has been well documented, as much of the ocean has gradually become land due to wind and rain erosion.

Humans evolved from the most primitive sea creatures.

The Earth was formed about 50 to 4.6 billion years ago.

About 3.9 billion years ago, primitive oceans appeared on Earth.

Life began to emerge 3.4 billion years ago. (3.4 billion years old fossil ancient cells).

1.3 billion-year-old red algae fossils of eukaryotes.

Jellyfish fossils in Precambrian strata.

Beginning 1.8 billion years ago, the earth entered the Sinian period, and the marine life during this period was mainly cyanobacteria, red algae and green algae.

The Aurora period is often referred to as the Algae Age. ‍

According to scientists' findings, life on Earth began to move from the ocean to the land, and the time of development from fish to amphibians should be in the late Devonian period. For the first time, the animals of that time appeared twice in animal traits. Later, it gradually evolved from amphibians to land animals.

The Devonian period should have been about 400 million years ago and ended 100 million years ago, about 50 million years ago, and was the Quaternary of the geological Paleozoic Era. During this period, life flourished in the middle and late periods, and there were many invertebrates in the ocean, and only some relatively early insects appeared on land.

Imagery of a Thalik fish.

At that time, there was a special fish called Titalik fish, which is now completely extinct, but at that time, this fish was actually quite abundant, Canada first discovered the fossil of this fish in 2004, and found that this fish can adapt to animals with low oxygen content, which means that this fish may have gradually evolved into an amphibian. This fish is supposed to be a transitional species between early marine fish and modern amphibians.

Compared with the older fish fossils found in the past, the fossils of these fish have obvious differences, their fins already have primitive carpal bones and simple toes, although these characteristics do not allow this fish to walk directly, but they are able to bear the weight of the body, which means that this fish is actually able to crawl and advance on land.

Fossil Thalik fish.

Tariq fish also has a distinctive feature of Tariq fish is the appearance of a stomata above the head, which means that this fish has the same lung as the gills function, because after this special function, they can crawl to the shore for a short time to survive, even if the oxygen content is relatively low, the temperature is relatively high places can also survive, of course, it is precisely because of this special function, in turn, it promotes the continuous development of the interior in the direction of strength.

Imagery of a Thalik fish.

This fish may be a mixture of the characteristics of an ancient fish species that is completely different from the tetrapod of today, which also reveals that the transition from aquatic to terrestrial organisms did not happen overnight, but only after gradual passage and evolution, although it is not fully understood how exactly it evolved.

Of course, this is only a speculation by archaeologists, and there may still be new species and evidence to be discovered in the future.

You misunderstood.

To put it simply, the primordial earth and the primordial ocean are not in the same time period, and the primordial ocean appeared at least a few hundred million years later than the primordial earth. It was the primordial earth that appeared first, and it took hundreds of millions of years before the primordial oceans began to appear. Because the temperature of the primitive earth was too high for life to survive, it was only after hundreds of millions of years that the earth cooled down and there began to be oceans, and life was born.

This line of earth is no longer a formed life, and can be replaced by primitive or something, so the earth originated 450 million years 1000

In the most primitive earth, there was no ocean, and at that time the earth was a blazing fireball, and nature could not produce life. The primordial oceans were created only after the earth was slowly cooling.

Primitive life originated from human beings, yes, I think so.

Humans were transformed from apes, and this has long been codified in textbooks. So what did apes come from? Would you be surprised if it evolved from fish?

However, there is some scientific basis for this. Fish can live in water because they have gills that can breathe in the water, which is also an important characteristic of fish. Modern humans cannot live in water because there are no gills that are adapted to breathe in water.

The respiratory organs of human beings are the lungs, and people will choke to death if water flows into the lungs. Therefore, when the ancients created the powerful monkey Sun Wukong, they still did not forget to say that it had to recite the trick of avoiding water in order to go deep into the bottom of the sea and go straight to the Dragon Palace. And Mike in "The Man from the Bottom of the Atlantic" can live both on the bottom of the sea and on land, which is just a fantasy of people, and in real life, this kind of "amphibious man" does not exist.

But our anatomists discovered a startling fact: human embryos also had gill cleft in the early stages of development. Is this an accident or is there a long-standing relationship between humans and fish?

According to the theory of biological evolution, humans, like fish, originated in water, and their distant ancestors also had gills that could breathe in water. Although the gills gradually degenerate over the long course of evolution, they still leave traces of gills in the early stages of human embryonic development. Scientifically speaking, not only humans, but all vertebrates, including amphibians, reptiles, birds, and mammals, are also like fish, in the early embryonic stage, in the pharyngeal cavity at the back of the head there is a left and right fissure of the gill cleft, which is the first manifestation of gill building.

The difference is that the gill slits of fish and amphibians develop as channels for breathing water, while the gill slits of reptiles, birds, mammals, and humans disappear from the embryo soon after they occur. The appearance of gill fissures in the early embryonic period is strong evidence of vertebrate origin. This "source" is the majestic ocean, and the gill slit is a common imprint of the origin of the ocean left by vertebrates and humans.

Life scientists speculate that after the birth of primitive life from the ocean, it was first developed from single-celled organisms, primitive organisms to vertebrate fish. One of the fish species (the total finfish) gradually moved from the sea to the land, evolved into amphibians, and then gradually evolved from water-breathing gills to air-breathing lungs. Later, amphibians evolved into reptiles, mammals, and even humans.

To this day, we can still see examples that support the above conclusions: the juvenile tadpoles of the amphibians, which live in the water like fish, breathe with gills, and then the tadpoles become frogs, land on land, and the gills become lungs, evolving to breathe with lungs. The only difference is the time difference, the process of the frog landing from the water takes place in a short period of two or three weeks.

However, when the total finfish landed from the sea, it took hundreds of millions of years.

Until there is definite evidence, both are correct, but which is more likely!

Why was human civilization born on land and not in the sea? It turned out to be because of this important resource.