Currently, there are several levels of organization of living matter.
Molecular Entry level organization of the living. Subject of study – nucleic acid molecules, proteins, carbohydrates, lipids and other biological molecules, i.e. molecules in the cell. Any living system, no matter how difficult it is organized, consists of biological macromolecules: nucleic acids, proteins, polysaccharides, as well as other important organic substances. At this level, various processes of the body’s vital activity begin: metabolism and energy conversion, transmission of hereditary information, etc.
Cellular The study of cells acting as independent organisms (bacteria, protozoa, and some other organisms) and the cells that make up multicellular organisms.
Tissue Cells having a common origin and performing similar functions form tissues. There are several types of animal and plant tissues with different properties.
Organ In organisms, starting from the intestinal, organs (organ systems) are formed, often from tissues of various types.
Organismic This level is represented by unicellular and multicellular organisms.
Population-Species Organisms of the same species, living together in certain areas, make up the population. Now on Earth there are about 500 thousand species of plants and about 1.5 million species of animals.
Biogeocenotic Presented by a combination of organisms of different species, to one degree or another dependent on each other.
Biosphere The highest form of organization of the living. Includes all biogeocenoses associated with general metabolism and energy conversion.
Each of these levels is quite specific, has its own laws, its own research methods. You can even distinguish sciences that conduct their research at a certain level of organization of living things. For example, at the molecular level, living things are studied by such sciences as molecular biology, bioorganic chemistry, biological thermodynamics, molecular genetics, etc. Although the levels of organization of living and stand out, but they are closely related and follow one from another, which indicates the integrity of wildlife.