According to the morphological and structural characteristics, organisms are divided into: plants, animals and other organisms;
According to the living environment, it is divided into aquatic organisms and terrestrial organisms.
Classification refers to the process of classifying all kinds of objects into their types one by one according to their different characteristics (properties, characteristics, uses and relationships, etc.). ). Biological classification is a method to classify different organisms according to their morphological structure, physiological functions, living environment and ways.
Extended data
Classification method
People have classified organisms in different historical periods. From the historical development, there are two classification methods, manual classification and natural classification, which also represent two stages of classification development.
1, manual classification
Biological classification is mainly based on the understanding of some morphological structures, functions, habits, ecological or economic uses of organisms, without considering the distance of biological kinship and the essential relationship of evolution and development, so most of the established classification systems belong to artificial classification systems.
2. Natural classification
The natural classification of plants is based on the morphological structure of plants and the genetic relationship between plants as the classification standard. According to the theory of biological evolution, many kinds of plants are actually roughly homologous. The difference of similarity between species can show the distance of their genetic relationship. The method of judging the genetic relationship between plants is based on the similarity between plants.
The natural classification of animals is complex, mainly based on homology. Taxonomists must consider various characteristics, including structure, function, biochemistry, behavior, nutrition, embryonic development, heredity, cell and molecular composition, evolutionary history and ecological interaction. The more stable the feature is, the more valuable it is in determining the classification.
Baidu encyclopedia-biological classification