How the first creatures on earth came to be

The first to emerge was the source of life proteins. Only then did single-celled life come on. The earliest is the mother of microorganisms.

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.

Life at this time was something like a bacterium, it had only one cell, and all plants and animals on Earth today are made up of cells. In the long years that followed, this small, single-celled life spread across the oceans and lived in solitude for about 2 billion years. At this time, the earth was empty and lonely, and the air was poisonous and impossible to breathe.

There is no oxygen in the atmosphere, and there is no ozone layer to protect life, and the intense ultraviolet radiation that hits the ground can kill the vast majority of life in just an hour. About 700 million years ago, single-celled organisms evolved into multicellular organisms, which, like today's plants, relied on photosynthesis to absorb carbon dioxide and release oxygen. It took a long time for this small life, which can only be seen under a microscope, to fill the Earth's atmosphere with oxygen.

In this way, the earliest life on Earth evolved from simple single-celled organisms to some more complex life. This is a major breakthrough in life. Some experts speculate that lichens were the first life on shore, and it was the decomposition of the rocks by the lichens, coupled with the natural differentiation that laid the groundwork for the creatures that landed later, because no other terrestrial life could survive without soil.

In the process of evolution, life has successively managed the environment in which we live. After life first climbed from the ocean to land, it continued to develop new habitats until it reached every corner of the planet. In the freezing ice of Antarctica, which is minus 23 degrees Celsius, there are algae and fungi that live freely; In boiling water that reaches its boiling point near an undersea volcano, there is also life that lives peacefully.

The animal that is known to live in the lowest part of the world is a bug-like sea creature; Life also exists at an altitude of more than 6 kilometers above sea level on Mount Everest. The ancient and vast sppt of the grain is the most single life form on the earth in ancient times, with a short survival period, about half an hour, and their free nature depends on external forces. Although the dark gray polyps are born and die instantly, the total amount is extremely large, covering the vast surface.

The age of the scuba is as simple and pure as the baby of the earth. The unsightly polyplet appears to be a vesicular monocytoplasma with several cilia at the edges of its body that fan slowly. They began 4.72 billion years ago, flourished, lasted for about a million years, and then declined to nothing in the last 400,000 years.

After the polyparticles, the earth ushered in the second batch of gorgeous flowers of life - microbial mothers. This is the real life of the earth, the microbial mother, which gushes out in large numbers during the period of apronization, and they dominate the world for about 300,000 years.

Inorganic to organic to simple unicellular organisms Multicellular organisms.