How are organisms classified? What are the most common classifications today?

1. Total prokaryotic community.

1) Archaea.

2) Eubacterial.

2. The total kingdom of eukaryotes.

1) Protist.

2) Planta.

3) Fungal kingdom (fungal kingdom).

4) Animalia.

Taxonomy is a fundamental method of studying living things. The most popular classification is the Five Realms System. Biologists divide organisms into five kingdoms based on their degree of similarity to each other: the prokaryotic kingdom, the protist kingdom, the fungal kingdom, the plant kingdom, and the animal kingdom.

1. Plants.

Plants are one of the main forms of life, including trees, shrubs, vines, grasses, ferns, and familiar organisms such as green algae and lichens. Plants can be divided into seed plants, algae plants, bryophytes, ferns, etc., and it is estimated that there are about 450,000 species in existence.

2. Animals. According to fossil research, the first animals to appear on Earth originated from the ocean. After a long geological period, early marine animals gradually evolved into various branches, enriching the early life forms on earth. Prehistoric animals appeared before the advent of humans and flourished during their respective periods of activity.

3. Microorganisms.

A large group of organisms, including bacteria, viruses, fungi and some small protists, microscopic algae, etc., which are small and closely related to humans. It covers many kinds of beneficial and harmful, and is widely involved in food, medicine, industry and agriculture, environmental protection, sports and many other fields.

The three major groups of biomes are:

The first category is autotrophic organisms, including various green plants and chemosynthetic bacteria, called producers, and the second category is heterotrophic organisms, including herbivores and carnivores, called consumers, and the third category is heterotrophic microorganisms, such as bacteria, fungi, soil protozoa and some small invertebrates, which live by decomposing animal and plant residues, called decomposers.

Prokaryotes, animals, plants, fungi.

1.It can be divided into the following three groups: Prokaryotes: are organisms that are made up of prokaryotic cells, including cyanobacteria, bacteria, actinomycetes, spirochetes, and mycoplasma.

2.Prokaryotes are so small that they are not visible to the naked eye and must be observed under a microscope.

3.Most prokaryotes can perform aerobic respiration underwater, and they were the first single-celled animals to emerge on Earth.

4.The smallest prokaryotes are mycoplasma.

5.Eukaryotes: is a general term for single-celled organisms and multicellular organisms with a nucleus, including all animals, plants, fungi, and other organisms with complex subcellular structures encased by membranes.

6.Non-cellular organisms: It is a life without a cellular structure, and generally refers to the life form of viruses that are scientifically classified in phyloevolution.

7.Including deoxyribonucleic acid virus, ribonucleic acid virus, etc.

Classification systems are hierarchical systems that typically include seven main levels: Boundary, Phylum, Class, Order, Family, Genus, and Species.

Taxonomy is a fundamental method of studying living things. Biological classification is mainly based on the degree of similarity of organisms (including morphological structure and physiological function, etc.), the organism is divided into different levels such as species and genus, and the morphological structure and physiological function and other characteristics of each taxa are scientifically described, so as to clarify the kinship and evolutionary relationship between different taxa.

Classification is based on the characteristics of organisms in terms of morphological structure and physiological functions. The basic unit of classification is species. The higher the taxonomic level, the less common denominator the organisms contained; The lower the taxonomic level, the more organisms have in common.

Understanding biological diversity, and protecting biological diversity, requires the classification of organisms.

It is divided according to the morphological structure, living habits and kinship between organisms. It can be divided into genera and species of the family Phylum Order. The higher the level, the more variety, and the less commonality; The lower the level, the less variety there is, and the more common denominators. The smallest unit of classification is the species.

There are many kinds of taxonomy, the most common is according to the morphological structure characteristics, that is, the biological relationship with the same or similar morphological structure is closer, and the same kind of organisms have many similarities. In addition, from a biological point of view, organisms of the same species can mate in their natural state and produce fertile offspring, otherwise they do not belong to the same species. For example, although horses and donkeys can give birth to mules, mules cannot be fertile, so horses and donkeys are not the same species. ,

The basic content of taxonomy.

Classification systems are hierarchical systems that typically include seven main levels: species, genera, family, order, class, phylum, and bounda. The species (species) is the basic unit, the closely related species are grouped into genera, the closely related genera are grouped into families, the family is subordinate to the order, the order is subordinate to the class, the class is subordinate to the phylum, and the phylum is subordinate to the boundary.

With the progress of research, the taxonomic level continues to increase, and secondary units can be attached to the upper and lower units, such as general class (superclass), subclass, subclass, general order (superorder), suborder, next day, general family (superfamily), subfamily, etc. In addition, new units can be added, such as stocks, groups, families, groups, etc., the most permanent of which are families, between subfamilies and genera.