3 . A set of cells of the same nature constitutes the tissue level of life , the degree of vitality in the structure of organs and organs , the structures of which are adapted to perform certain generalized, specific functions . In multicellular organisms, tissues and organs have common similarities and develop during ontogeny . The structure of the organs of the animal body consists of 4 different tissues (epithelium, connective tissue, muscle, nerve)
4. The organizational form of life at the level of the organism allows to study the important processes that take place in different beings as a whole, taking into account the specific aspects of the organism. All vital processes that take place in each organism are self-regulating according to the activity of the nervous, endocrine and immune systems, maintaining the stability of the internal environment.
5. Living things have a common level of living and life activity at the population and species level . At this level, the processes specific to a group of organisms belonging to the same species are studied. Population is an elementary structural unit of the evolutionary process, and the process of species formation takes place at the population level.
6. At the biogeocenotic and biosphere levels of life, the coexistence of populations in a particular area, their interaction and their relationship with the environment in the exchange of matter, energy are studied. This process determines the relationship between the organism and the environment, as well as the circulation of matter and energy. The interdependence of living and dead nature on our planet, the occurrence of any change in their composition, shows its impact on the lifestyle of the representatives of living organisms. Each higher order level of survival incorporates a lower order level as an organizational element. Accordingly, all branches of science that study the levels of life ( molecular biology, cytology and histology, from anatomy to ecology ) are interconnected.
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