How many species of animals are there in the world, and what are them? Please write them out one by

According to the stage of evolution and the environment in which they live, they can be roughly divided into six types.

1. Unicellular animals 2, aquatic animals 3, amphibians 4, reptiles 5, birds 6, mammals.

I don't know if the owner of this division is satisfied... In fact, if you are essentially divided... It should be from unicellular to multicellular... The angle of the notochord to the spine is differentiated... However, the distinction is finer... More complicated·· The landlord can go to check the details of biological evolution... There is also the classification of organisms (kingdoms, phyla, classes, orders, families, genera, species).

I'm afraid it will take a year to write them out one by one, ,..

According to zoologists, there are currently about 1.5 million known species of animals in the world. Animals, i.e., things that are capable of moving or moving autonomously, including people. Scientists divide extant animals into two categories: invertebrates and vertebrates according to the presence or absence of a vertebrate in their bodies.

According to fossil research, the first animals on Earth originated from the ocean, before the advent of humans.

Animals on Earth are constantly evolving and reproducing according to the trend from the lower to the higher, from the simple to the complex.

Scientists have discovered more than 1.3 million species of invertebrates, including earthworms, squid, oysters, jellyfish, spiders, snails, and more.

According to zoologists. There are about 1.5 million known species of animals on Earth. Animals can be divided into two main groups: vertebrates and invertebrates.

Vertebrates have a spine on the back of their body that is made up of many vertebrae. Generally, the individual is larger. Today, chasing animals can be divided into five major groups: fish, amphibians, reptiles, birds and mammals.

Fishes are the largest group of vertebrates.

There are 25,000 30,000 species of saltwater, fish and freshwater fish, such as carp, yellow croaker, etc. There are more than 2,000 species of amphibians. Such as frogs, etc.

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, etc. There are more than 4,500 species of beasts.

Such as horses, cows, lions, tigers, etc. Invertebrates are animals that do not have a vertebral column on the dorsal side, and their species number accounts for 95% of the total number of species of animals, and they are the original form of animals. BBC host Sir David Adeborough once said:

If overnight all vertebrate animals disappeared from the face of the earth. The world remains unharmed. But if it is the invertebrates that disappear, the entire terrestrial ecosystem will collapse"。

The body of invertebrates does not have a vertebral column, most of the individuals are small, but there are many species, such as flies, mosquitoes, grasshoppers, butterflies and other insects are invertebrates, and invertebrates can be divided into eight categories. These include: protozoa, flattened animals.

Coelenterates, echinoderms, arthropods, mollusks, annelids, nematozoa.

The number of animal species in the world is constantly changing. There are many species of animals that have not yet been discovered. And every year some old ones disappear and some new species are born.

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 their bodies, and they are generally larger. The body of invertebrates does not have a vertebral column, and most of the individuals are small, but there are many species, accounting for more than 90% of the entire animal species.

Insects such as flies, mosquitoes, grasshoppers, butterflies, etc., are all 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.

No one knows exactly how many species of life there are on Earth. The unveiling of this answer is closely related to our efforts to maintain biodiversity, and it can also address major issues of evolution and environmental management.

Although we have been studying taxonomy for more than 250 years, there are still many opinions on how many species there are on Earth, ranging from 300 to 30 million species. Owing to the lack of a centrally managed, counted body, no one even knows the exact number of known species.

There are about a trillion species of animals in the world. There are about a trillion animal species living in the world, distributed on the ground, in the ocean, underground and in the air, scientists point out that the number of one trillion is only a relatively accurate estimate, and that there are only one trillion species that people can study and describe today, which means that experts know almost nothing about life in the world, especially the lower species.

The world's most famous animal speciesAt present, there are about 1.5 million species of animals known in the world, 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, the general individual is larger, the body of invertebrates does not have a vertebrae, most of the individuals are very small, but there are many species, accounting for more than 90 of the entire animal species, such as flies, mosquitoes, grasshoppers, butterflies and other insects are invertebrates.

There are many, many, many more in the world.

According to the stage of evolution and the environment in which they live, they can be roughly divided into six types.

1. Single-celled animals.

2. Aquatic animals.

3. Amphibians.

4. Reptiles.

5. Birds. 6. Mammals.

I don't know if the owner of this division is satisfied... In fact, if you are essentially divided... It should be from unicellular to multicellular... The angle of the notochord to the spine is differentiated... However, the distinction is finer... More complicated·· The landlord can go to check the details of biological evolution... There is also the classification of organisms (kingdoms, phyla, classes, orders, families, genera, species).