-
How did life on Earth come about?
-
In ancient times, there was a lot of water on the earth, and the atmospheric content was mainly methane, ammonia, and hydrogen.
Water vapor, these gases produce chemical reactions when they encounter lightning, producing the most basic substances of life--- amino acids, and life is born, and later due to evolution, from aquatic to terrestrial, from low to high, until today.
Take the example of the evolution of life on Earth:
1. There is a belief that after an alien object hits the Earth, the organic molecules on the object are born to the Earth. The process of organic matter production on this celestial body is roughly the same as the following two mechanisms.
2. Oxygen, nitrogen, hydrogen, carbon and other elements on the earth form proteins under the action of the sun's ultraviolet rays and thunderstorms; It is also a coincidence that the earth is at the right distance from the sun, so there is life. Life then evolves further due to the constraints of the environment.
Then after n billion years of evolution, humans were born.
Three: Billions of years ago, Earth's weather contained much less oxygen than it does now, and the mushrooms produced during volcanic eruptions were about 200 degrees Celsius warmer than they are today. This condition is very conducive to the synthesis of organic polymers and amino acids from a variety of substances in the mushroom cloud.
These substances fall to the ground, and after years of interaction, they can synthesize RNA molecules that have the ability to replicate themselves, making the emergence of primitive cells possible.
-
How did life on Earth come aboutOr related to lightning, Venus and Mars have missed their chances.
-
How did life on Earth come about?
-
Ask God, and maybe it will work out.
-
Billions of years ago, there were a large amount of carbon dioxide, nitrogen and other gases and some water vapor in the atmosphere of the earth, and later the earth's temperature dropped, and the water vapor turned into water and formed the sea. After processes such as lightning and volcanic eruptions, through a series of chemical reactions, amino acids are formed, and finally proteins are produced, and the ocean at that time was like a hot pot of soup, pregnant with primitive life. Primitive life was microorganisms, and later, organisms evolved into two types, one containing chlorophyll and the other being heterotrophic animals.
2. The other theory is that life on earth comes from space. According to scientific and research meteorites, some meteorites have carbohydrate compounds, and some are not found on earth. Perhaps by chance, meteorites brought life to Earth.
-
(1) Human exploration.
Organisms cannot be produced from non-living matter on the earth at present, and organisms at present can only be produced through reproduction.
b) Primitive Earth.
1 High temperatures, thin crust, primitive atmosphere, and later water.
2 Original atmospheric composition: methane, hydrogen, water vapor, carbon dioxide, anxia, and ozone layer.
iii) The origin of life on Earth.
1 Inorganic Matter Small Molecule Organic Matter Larger Molecular Organic Matter Macromolecular Organic Matter Macromolecular Organic Matter Forming Boundary Film Primitive Life.
2 The birth of life is the result of chemical evolution.
iv) several major years.
The primitive Earth was formed 4.6 billion years ago.
The primordial ocean was formed 3.8 billion years ago.
3.5 billion years ago, primitive life was formed.
-
Although life could not be formed on the primitive earth, the organic matter that made up life could be formed. Scientists speculate that the primordial atmosphere was subjected to the long-term action of natural conditions such as high temperatures, ultraviolet rays, and thunder and lightning, which formed many simple organic matter. Later, the temperature of the earth gradually decreased, and the water vapor in the primitive atmosphere condensed to form rain that fell to the ground, and this organic matter followed the rain into lakes and rivers, and eventually collected into the primitive ocean.
It was about 1 billion years after the formation of the earth that primitive life gradually formed.
-
I think that the original man lived on the moon, and one day the weather on the moon was so bad that people couldn't stand it, so they came to the earth and started killing dinosaurs.
-
Where did the "life" on Earth come from? The answer may surprise you!
-
There are a lot of cells in the ocean, and even now, they will evolve and evolve, and in a few years they may be another world.
-
They all evolved from apes, and although this concept is well known, there are still many people who support mythology.
-
The most primitive life on Earth is made up of carbon and isolated organic matter. After a long period of evolution and evolution, a wide variety of species have been formed.
The most basic living system on the earth is the cell, because from the cell to the tissue, from the tissue to the organ, from the organ, from the system to the individual, from the individual to the population, different populations and their environments form communities, and the biosphere is the largest ecosystem, which shows that there are different levels of living systems.
The most authoritative scientific explanation now is that life on Earth originated in the primordial oceans. After tens of millions or even hundreds of millions of years, elements such as carbon and nitrogen precipitated together to form primitive lifeforms, and after a long period of time, primitive lifeforms evolved into the lowest cell bodies. Eventually, it evolved into marine life. >>>More
The solar system is a nebula, in the cosmic region very close to the solar system at that time, there was a large star death event, the mass of this star is at least 8 times more than the sun, before the death, this late star, that is, the supernova had a violent instantaneous **, this instantaneous big ** made the density of the nebula where the solar system is located changed, the collapse of this region began, followed by the change of gravity, a large number of movements and collisions began, and the final result was the formation of a huge sun, It has a very high internal temperature, with a core temperature of up to 15 million degrees. The rest of the various materials were thrown into space, and because of the huge mass of the sun, they began to move around the sun and slowly began to coalesce together to form planets. >>>More
The earliest life on Earth.
500 million years ago, the land was full of bare mountains and earth, and there was no life except stone and sand, and there was no soil on which life depended. It wasn't until 425 million years ago that seaweed accumulated enough oxygen in the Earth's atmosphere to form an ozone layer to protect life exposed to sunlight that organisms could surface. The first life on Earth appeared 4.5 billion years ago. >>>More