How many “boundaries” are there in the natural classification of living things?

2022-05-09 0 By

A: The natural classification of organisms according to their kin has the following “kingdom” system.(1) Binary system: plant kingdom, animal kingdom.Linnaeus proposed in 1735 that living things move.(2) Three kingdom system: protist kingdom, plant kingdom and animal kingdom.Heckel proposed in 1866 that many single-celled organisms have both dynamic and plant properties.(3) Four kingdom system: bacteria kingdom (bacteria and cyanobacteria), protozoa kingdom (fungi and some algae), plant kingdom, animal kingdom.Copeland1938, 1956.The earth’s organisms can be divided into two basic groups, prokaryotic and eukaryotic, representing the two basic stages in the history of biological evolution and the two basic types of cell structure.(4) Five-kingdom system: prokaryotic kingdom (bacteria and cyanobacteria, etc.), protist kingdom (single-celled eukaryotes), fungi kingdom, plant kingdom and animal kingdom.Weitek proposed in 1959 that the complexity of the cell structure and the different nutritional modes.■ There are three stages in the history of life: prokaryotic unicellular stage, eukaryotic unicellular stage and eukaryotic multicellular stage.The three major directions of life evolution are: photosynthetic plants as natural producers;Fungi that decompose and absorb organic matter and are decomposers in nature;Animals that consume organic matter for nutrition are consumers of nature and decomposers at the same time.■ The five-kingdom system does not reflect the acellular biological stage.Chen Shixiang proposed the kingdom of viruses (non-cellular organisms) in 1979.(5) the system of six kingdoms and three prokaryotes: the system of six kingdoms: prokaryotes are divided into two kingdoms: archaea and eubacteria;Eukaryotes are divided into four kingdoms: protists, fungi, plants and animals.Woese and Wolfe, 1987.Prokaryotes have two important evolutionary branches.■ Three proterozoic system: archaean proterozoic, eubacterial proterozoic, eukaryotic proterozoic (protists, fungi, plants, animals).Woese1990.Protista (protista) any of the earliest single-celled or simple multicellular organisms on earth.Protists can be equivalent to simple eukaryotes, not prokaryotes, and are evolutionarily superior to prokaryotes.