history of life on earth

The story of life on Earth's evolution is incredibly complex and fascinating. It starts with simple single-celled organisms and progresses over billions of years to the diverse array of species we have today.

Earth's evolution process was as follows: - About 4.6 billion years ago, the Earth was born. At that time, the surface of the Earth was covered with magma and lava. The temperature was close to 5000 ° C. The remnants of the Big Bang kept hitting the surface of the Earth. - About 4.5 billion years ago, an asteroid named Theia hit Earth. The fragments formed the moon, and the tidal force of the moon slowed down the Earth's rotation. - About 4 billion years ago, a huge comet with water hit Earth. After that, Earth experienced a long-term rain that lasted for 3 million years. Earth became a blue planet, which laid the foundation for the birth of life. - 3.7 billion years ago, blue algae in the ocean began to photosynthesize, releasing large amounts of oxygen and growing explosively. - A billion years ago, Earth entered the Great Ice Age, which lasted for tens of millions of years. Earth became a huge ice ball. - About 500 million years ago, during the Cambrian-era, there was a great explosion of life, and all kinds of animals and plants began to be born. - About 200 million years ago, dinosaurs stepped onto the stage of history and ruled the earth for about 130 million years. - 65 million years ago, an asteroid with a diameter of about 10 kilometers hit the Earth, causing 90% of life to go extinct, including dinosaurs. - About 2 million years ago, the first Homo Spico was born on Earth. Humans gradually stepped onto the stage of Earth's history and ruled until now. During the Archean Era (2.4 billion years ago), the solid core was formed, the oceans were formed, life appeared, single-celled organisms appeared, and the Earth was occupied by the oceans. During this period, it also experienced the Huron Ice Age, where cyanacea produced oxygen under photosynthesis and large-scale biological extinction occurred. The second major cooling occurred when the Rodinia supercontinent was formed, and the sponge was the first animal to appear. After that, there was the Cambrian-era explosion of life in the Permian period, with the appearance of early vertebrae; the Ordovican-era extinction of land plants; the Sahara glacial period of early fish; the Devonian-era extinction of the carbonatite period of Pangu Continent; and the Caino-era after the extinction of dinosaurs, the ancestors of human beings appeared. At the beginning of the Earth's formation, it was one of the many new planets orbiting the sun. The original Earth was much smaller than it was now, and its surface was covered in magma. During this period, it was constantly hit by meteorites. Later, it was hit by a primitive planet the size of Mars. Its axis tilted 23° to form the four seasons, and the impact fragments formed the moon. Millions of years after the moon formed, the earth gradually cooled down and had a rocky and metallic crust. The moon also completed the cooling process. About 4 billion years ago, after the debris from the formation of the solar system hit the Earth, the Earth had oceans and an atmosphere slowly appeared. Life began to evolve from single-celled organisms to multicellularized organisms, from marine organisms to amputated organisms, terrestrial organisms, and sky organisms. After the extinction of dinosaurs, small mammals appeared on the stage, and humans multiplied and evolved on the African continent and went global.

In 1999, the American journalist David. Ike interviewed the knowledgeable South African wise man, Credo. Mutewa's interview was called the most shocking interview in the history of Earth. In the interview, Credo mentioned that in ancient times, the extraterrestrial lizardmen came to Earth as " gods ", modified human genes, transformed androgynous humans into men and women, taught humans language and knowledge, and even asked humans to mine. They would mate with human females to give birth to 'half-human, half-god' descendants to rule the human race. Credo also mentioned the appearance of the alien lizardmen, such as their height of more than three meters, slender figure, support of the body by the cartilages, different number of fingers on the hands, and some horns on the head. A lot of the information he said was related to ancient China mythology, such as the pronunciation of Nuwa and Pangu in Africa and the fact that they were believed to be lizardmen. The novel," The Couple's Universe: The Amazing Legend of Shen Zhen " is equally exciting. Everyone is welcome to click and read it!

The six stages of Earth's development were as follows: 1. The early stage of the Earth's formation: About 4.5 billion years ago, the Earth was born from frequent and violent rock collisions. At the beginning of its formation, the outside was constantly hit by meteorites, and the inside was constantly collapsing and undergoing nuclear reactions, heating up to form hot lava. Heavy matter collapsed into the core under the effect of gravity, while light matter stayed on the surface to form an extremely thin crust. Volcanic activity was frequent, and the gases ejected from volcanoes rose to form the primitive atmosphere. The primitive atmosphere formed simple organic matter under the influence of environmental factors such as thunderstorms, intense sunlight, and high temperature. 2. The age of the great impact and the formation of the oceans: About 4 billion years ago, the debris (asteroids and comets) left behind after the formation of the solar system slammed into Earth, lasting 20 million to 200 million years. The comet contained a large amount of water resources. After the impact, the Earth had an ocean and an atmosphere slowly appeared. 3. Origin and early development of life: The earliest life appeared 3.8 billion years ago. It was originally a single-celled organism, located near the crater of the Earth's seabed. From single-celled organisms, they gradually evolved into multicellularized organisms. From marine organisms, they developed into amphibious organisms, then to terrestrial organisms. During the dinosaur era, there were even sky creatures. 4. Proterocosmic Era: 2.5 billion years ago, the single-celled microorganisms, blue-green algae, appeared on Earth. They produced a large amount of oxygen and triggered a major oxidization event. The greenhouse gases such as carbon dioxide and methane were gradually replaced by oxygen. The concentration of oxygen rose sharply, and the concentration of greenhouse gases continued to decrease. The global climate became cold, and the polar ice cap formed. Finally, the entire Earth was covered in ice and snow, entering the Snowball Era. This period lasted intermittently for about 1.1 billion years, but microorganisms still lived under the ice. 5. Changes on Earth after the asteroid impact: About a billion years ago, an asteroid hit Earth. The shock wave from the impact caused the ice to boil and produce a large amount of greenhouse gases, melting the global ice. At the same time, it also caused the Earth's continental plates to split and re-form the new continent, the Rodinia supercontinent. Continents, mountains, rivers, lakes, and seas began to form. Earth was about to enter the next geological era. 6. Modern biological development and the emergence of humans: After the extinction of most dinosaurs, avian dinosaurs evolved into today's birds, small mammals replaced dinosaurs on the stage of history, humans multiplied and evolved on the African continent, and then gradually walked out of Africa and into the world.

There were many powerful creatures in the history of Earth. - Tardigrade was known as the strongest species on Earth. It was the only creature that could survive in space and had the ultimate ability that humans envied. - Megalodon was a huge fish and was still considered one of the largest fish on Earth. Its largest body size can reach 20.3 meters, and its heaviest weight is 103 tons. The average body size is 16 - 18 meters, and the average weight is 60 - 70 tons. - On the beach of the west coast of Africa, there was a large soft-bodied conch that looked like a snail. It was called the African Neptune snail. Its shell could be up to 30 centimeters long and could defend against enemies. Its body was considered to be a giant among mollusks. - Although the life of a golden cicada was only about four to six years, it could not be drowned or frozen to death, as if it had a special ability.

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There were currently two mainstream views in the scientific community regarding the origin of life on Earth. One was the theory that the basic elements of life came from outer space. When meteorites passed through space, they might have carried organic substances (such as acids) from other planets or interstellar space. When the meteorites hit Earth, these organic substances were released to Earth. Under certain coincidences, these acids gathered in the crater of the seabed about 3.6 billion or 3.8 billion years ago to form the world's first life. This life had the ability to obtain material and energy from the outside world (survival) and self-reproduction. For example, in 2009, American scientists discovered gly on a comet, which provided some evidence for the alien theory. The other theory was that the basic elements of life were first born in the atmosphere. During the early days of the Earth, gases such as methane, nitrogen, and carbon dioxide in the primitive atmosphere might have synthesized small molecular organic compounds such as aa under the effects of violet rays and lightning. The chemical reactions in the water and the rock sphere might also promote the formation of aa, which flowed into the sea. In 1953, American scientists Miller and Urey conducted an experiment to simulate the atmospheric environment of the primitive Earth. Through the circulation of a mixture of methane, hydrogen, and hydrogen with water, coupled with electric sparks to simulate thunder and lightning, a week later, the device produced small biological molecules such as the most basic of life, four of which were the most basic of life. This experiment provided strong support for the theory of internal growth. In addition, the hypothesis of the underwater hot springs was also related to the origin of life. The early oceans of Earth formed a high-temperature, strong acid and strong base environment due to the activity of underwater volcanoes and hot springs. However, extreme thermophiles were found here. This kind of bacteria appeared on Earth about 3.5 billion years ago and may be the common ancestor of all living things on Earth. Therefore, scientists speculated that this may be the place where life was born. "The Island of Life" is also a wonderful novel. Everyone is welcome to read it!

Based on context alone Earth was formed about 4.6 billion years ago as a cloud of gas and dust. In the early stages of its formation, the Earth was a hot sphere, mainly composed of molten matter. As time passed, heavier materials such as iron and nickel-based materials gradually gathered toward the center to form the Earth's core, which released a large amount of heat. After that, the Earth began to gradually cool down, and lighter materials such as rocks began to solidify on the surface of the Earth to form the crust. During this process, Earth also suffered a large number of asteroids and comets. About 3.8 billion years ago, the environment on Earth gradually stabilized, and primitive oceans began to appear. The appearance of the ocean provided a cradle for the birth of life. In the billions of years of evolution, the composition of the Earth's atmosphere was also constantly changing. In the early days, the atmosphere was mainly composed of carbon dioxide, methane, and so on. With the emergence of photosynthesizing organisms, oxygen began to accumulate in the atmosphere. Plate movement also played an important role in the evolution of the Earth. The collision and separation of the plates shaped the Earth's mountains, ocean basins and other terrains, and affected the Earth's climate and biological distribution. From the perspective of life, simple single-celled organisms were born in the early oceans, and then gradually evolved into multicellularized organisms, plants, and animals. After many large-scale extinction and the outbreak of new species, it gradually formed the complex and diverse ecosystem today.

Earth's evolution could be roughly divided into three stages. The first stage was the formation of the Earth's sphere, with a time limit of about 4600 to 4200Ma. At the beginning of the Earth's birth, it was a hot ball composed of hot liquid materials (mainly magma). As time passed, the surface temperature dropped, and the solid core gradually formed. The denser materials moved to the core, and the less dense materials floated on the surface of the Earth, forming the Earth, which was mainly composed of rocks. The second stage was the Archean and Proterocosmic periods, with a time limit of 4200 - 543Ma. The Earth continuously released energy. The water vapor, carbon dioxide, and other gases released by high-temperature magma eruptions formed the early atmosphere (primitive atmosphere). As the water vapor increased, it condensed into rain and fell to the surface, forming the primitive ocean. The third stage was the Phanerozoon period, which lasted from 543Ma to the present. During this period, life flourished, geological evolution was rapid, geological processes were rich, and geological bodies were widely preserved. It was the main research object of geological science, and the basic theory and basic knowledge of geological science were established.