Where did the animals of Earth I come from? How many species of animals are there on Earth?

Asteroids brought primitive life, which then evolved into various animal ......

Life on Earth has a common part, which is protein synthesizers.

Protein is an organic substance, and this organic matter can be synthesized by human beings through physical and chemical methods. Based on this, we believe that life on Earth synthesized proteins from the ancient environment of the Earth.

However, protein is not life, it is only a necessary condition for the existence of life. The decomposition and synthesis of a large number of proteins make certain molecular chains have the function of replication, which is the so-called cloning

In the broth environment, single cells appear that can replicate themselves, and when single cells multiply in large numbers, decompose and aggregate, animal cells and plant cells appear, as well as a combination of animal and plant cells. In the process of polymerization and decomposition of these cells, there is always a small probability of deviation, which we call mutation. Then there were small animals, small plants, and mixed animals and plants.

Life evolved from the lower levels to where it is today.

It is a doctrine that the earth itself generates life.

We can verify this experimentally, that is, life can be synthesized.

The current progress of this experiment is that we have synthesized urea, insulin, and we are still far from synthesizing life. At present, biotechnology has not yet reached the level of synthetic life. When we are able to synthesize life, then the problem is solved.

There is also a lazy doctrine, which believes that life is foreign, and this doctrine has a fatal problem, that is, foreign life is ** from **? As soon as that question is asked, they move aliens, gods, ghosts, gods, you don't know, anyway. It's a chaotic and groundless train run.

There are 1.5 million species of animals in the world.

There are about 1.5 million species of animals in the world, and recent studies suggest that there may be 10 million species of insects worldwide, about half of all living species on Earth. However, there are currently only 1 million species of insects with names and surnames, accounting for 2 3-3 4 of the known species in the animal kingdom. It can be seen that there are still 90% of the world's insect species that we do not know.

According to the most conservative estimates, there are at least 3 million species of insects in the world, and there are still 2 million species to be discovered, described and named. Approximately 1,000 new species of insects are published each year in the world, and they are included in the Zoological Record, making the journal a must-consult search tool for researchers working on animal taxonomy.

Among the named insects, there are as many as 350,000 species of Coleoptera (beetles), of which the weevils are the largest, including more than 60,000 species, which is 10 times that of mammals. Lepidoptera (butterflies and moths) are next with about 200,000 species. There are about 150,000 species of Hymenoptera (bees, ants) and Diptera (mosquitoes, flies).

The figure below shows the relative number of known species of different taxa in the kingdom Animalia.

Not only are there many species of insects, but there are also many individuals of the same species, some of which are surprisingly large. An ant colony can have up to 500,000 individuals. A tree can contain up to 100,000 individual aphids. In forests, there can be 100,000 springtail insects per square meter.

To say exactly how many species of animals there are on the earth, I am afraid that even experts dare not guarantee it, because the understanding of animals is also accumulated with the continuous discovery of science and the continuous understanding of nature. China is home to one of the largest species of wildlife in the world.

There are about 6,266 species of vertebrates in China, including about 500 species of mammals, about 1,258 species of birds, about 376 species of reptiles, about 284 species of amphibians, and about 3,862 species of fish, accounting for about one-tenth of the world's vertebrate species. There are more than 50,000 species of invertebrates and 150,000 species of insects.

According to zoologists, there are about 1.5 million known species of animals on Earth.

Animals can be divided into two categories: vertebrates and invertebrates, vertebrates have a vertebral column composed of many vertebrae on the back of the body, and the individual is generally larger; Invertebrates have no vertebral columns, and most of them are small, but they are diverse, accounting for more than 90 of the entire animal population. For example, insects such as flies, mosquitoes, grasshoppers, butterflies, etc., are invertebrates. Vertebrates can be divided into five major groups: fish, amphibians, reptiles, birds and mammals.

Fish are the largest group of vertebrates, with a total of 25,000 to 30,000 species including marine fish and freshwater fish, such as carp and yellow croaker. There are more than 2,000 species of amphibians, such as frogs. There are more than 3,000 species of reptiles, such as snakes, turtles, crocodiles, etc.

There are 9,000 species of birds, such as pigeons, sparrows. There are more than 4,500 species of mammals, such as horses, cows, lions, tigers, etc. There are still many species of animals in the world that have not yet been discovered.