What is the meaning of the existence of life on earth

To exist is to be reasonable, and life exists because it can exist. To say meaning, it is to make its own form more complex and more adaptable to this environment. The emergence of wisdom is also to be able to better adapt to the environment; Wisdom's curiosity and exploration of the outside world are also determined by this reason...

Water and air are one of the most important substances on the earth, thanks to which life is available on the earth.

The origin and evolution of life are closely related to the origin and evolution of the universe. The constituent elements of life, such as carbon, hydrogen, oxygen, nitrogen, phosphorus, sulfur, etc., are derived from the evolution of the elements after the "big **". The data show that the chemical evolution of the pre-biological stage is not limited to the earth, and the products of chemical evolution exist widely in space.

In interstellar evolution, certain biological monomolecules, such as amino acids, purines, pyrimidines, etc., may be formed in interstellar dust or condensed nebulae, and then biological polymers such as polypeptides and polynucleotides are produced under certain conditions on the planet's surface. Through several transitional forms of pre-biological evolution, the most primitive biological systems were finally formed on Earth, that is, life with primitive cell structures. At this point, the evolution of biology began, and countless complex life forms have been produced on Earth today.

External conditions: Stable lighting and a safe cosmic environment, and the eight planets go their own way.

Self-conditions: the earth has a moderate mass and volume, there is air suitable for living organisms to breathe, the earth is at a moderate distance from the sun, so that the earth's surface has temperature conditions suitable for the occurrence and development of life processes, and there is liquid water on the earth.

The Earth's rotation period is moderate.

The appropriate distance between the sun and the earth causes the temperature of the earth to be neither hot nor cold, and the temperature difference is also small, and the liquid water will not be evaporated quickly, nor will it be completely frozen, so that the water can flow and evaporate into the atmosphere, forming a water cycle. In addition, the Earth's atmosphere is stable, preventing the impact of other small celestial bodies.

1.necessary constituent substances. There must be carbon, hydrogen, oxygen, nitrogen and other elements of life. At the same time, it should also be noted that living matter is transformed from simple organic matter, and the production of organic matter lays a direct material foundation for life.

2.Moderate light and heat. The meaning of light and heat is, first and foremost, the source of energy for life activities.

Light plays an extremely important role in the conversion of inorganic matter into organic matter. Moderate light and heat produce the right temperature, which of course ensures that the chemical bonds of the carbon atoms are not broken and that biological processes are carried out normally.

3.Liquid water. Water exists in a liquid state at a suitable temperature. Water is an absolutely indispensable component of living organisms, and it is also an important medium for life activities, and some minerals required by living organisms come from water.

4.Atmosphere. A primordial atmosphere similar to that on Earth is far from enough to ultimately determine the existence of life.

This atmosphere can be synthesized by ultraviolet irradiation or electric sparks, but because it lacks enough oxygen, it cannot protect life from meteorites, the lack of ozone layer does not protect life from ultraviolet damage, and it does not have the appropriate components to protect the heat on the planet's surface. An atmosphere suitable for living beings to breathe is essential for the existence of life.

5.The above conditions are maintained for a long time. So that life has a process of generation, development, and evolution. Otherwise, even if life is generated, it will be a flash in the pan, and it will not exist in the true sense.

The earth is massive, attracts water and air, and abundant water resources are indispensable, as well as the protection of the atmosphere.

The Earth has a magnetic field that can withstand many cosmic rays.

The Earth is at a moderate distance from the Sun, making the Earth's surface temperature suitable for living organisms.

The distance between the sun and the earth is moderate.

The Earth is moderate in volume and mass.

There is liquid water on Earth.

There is a safe cosmic environment.

That's exactly what I'm doing.

That's the summary.

About 3 billion years ago, after the heavy rains stopped, the Earth entered another stage of development. The earth's primitive atmosphere contains ammonia, methane, hydrogen cyanide, hydrogen sulfide, carbon dioxide, hydrogen, water and other components, but there is no free oxygen, some gases in the atmosphere and some soluble substances on the surface of the earth's crust are dissolved in water, and a series of small molecule organic compounds, such as amino acids, nucleotides, monosaccharides, fatty acids, etc., are naturally synthesized under the action of cosmic rays, solar ultraviolet rays, lightning, high temperatures, etc., which are gathered in the primordial ocean to form the so-called "primordial soup" of Haldane. Thus preparing the necessary conditions for the birth of life.

When small organic molecules such as amino acids, nucleotides, monosaccharides, and fatty acids are formed, they can further form complex organic substances under the right conditions. For example, proteins, nucleic acids, polysaccharides, lipids and other macromolecular substances. Among them, the formation of proteins and nucleic acids plays a very important role in life phenomena, and there are two main views on their formation.

1) Terrestrial origin: They believe that the polymerization reaction occurs in the local area of the volcano, and the organisms generated by the aggregation are collected into the ocean by rainwater, and continue to develop into complex organic matter under certain conditions.

2) Marine origin: It is believed that small organic molecules such as amino acids and nucleotides in the primitive ocean can be adsorbed on the active surface of substances such as clay, and polymerization reactions can occur in the presence of appropriate condensation agents.

Biological macromolecules cannot independently express the phenomenon of life, and can only express the germination of life when a numerous, or even million, protein, and nucleic acid-based multimolecular system is formed.

Biological macromolecules aggregate in large quantities in solution, thus forming various independent multimolecular systems, and agglomerates or microspheres appear. Because the multimolecular system can play a catalytic role on the organic surface, and in turn act with the polymerization of various monomers, promote the production of higher proteins and nucleic acids, and then through the long-term process of gradually improving the order, its structure and function will become more complex and perfect, thus giving rise to primitive life.

The material basis of the existence of life is proteins and nucleic acids, and the unit that expresses the basic structure and function of life phenomena is the cell. According to this explanation, the origin of life begins with the study of how proteins and nucleic acids are produced, and this question is closely related to the specific conditions under which the earth was first formed.

When the earth was first formed, orange slippery solid dust, which gathered and combined, formed the original earth's core;Its exterior is surrounded by a large amount of gas, which is the original atmosphere of the Earth when it was first formed. Subsequently, due to the continuous accumulation and contraction of matter, as well as the fission of radioactive materials inside, a large amount of energy was generated, and the earth was in a high temperature stage, and the primordial atmosphere gradually began to disappear. When the Earth's surface cools again, the Earth's outer surface opens up to form a relatively stable secondary atmosphere.

The secondary Dachi-age atmosphere outside the earth is mostly composed of a large amount of water vapor released by volcanic eruptions. Water vapor in the atmosphere, due to cooling, forms heavy rainstorms. Due to heavy rains, the dry ground of the earth began to have water.

In this way, after tens of millions of years, more and more water on the earth was formed, forming a primordial ocean, which is also the original primordial hydrosphere of the earth. Clearly, primordial oceans were initially formed in the Archean period (about 3,82.5 billion years ago). The primordial oceans are constantly developing on the earth, from small to large, from shallow to deep.

At that time, the pristine ocean was less salty and the water temperature was much higher than it is now, with pristine sea temperatures estimated to be as high as 80. The formation of primordial oceans created the conditions for the birth of primitive life. The primeval ocean not only prevents the destruction and killing of primitive life by strong ultraviolet rays, but also provides an extremely favorable environment for the existence and development of primitive life.

Therefore, there is scientific truth in saying that "the ocean is the cradle of life".

Atmosphere and water are the two pillars of the Earth's unique environment and resources. Astronomers have yet to discover another planet that is as superior to Earth's Rim as it is, mainly because they don't have Earth's atmosphere and abundant water. The earth's thriving biological world and highly developed culture are the most beautiful flowers of the Ubu Zhixiang type of Bo that these two pillars have bred.