A biological system is a collection of elements that are connected and dependent on each other, forming a single whole, perform certain functions, and also interact with the environment or other elements and systems.
The main functional elements of biological systems have different levels of organization and appropriate classification. Among them, one can name both individual molecules and cells, tissues and organs, as well as whole organisms, their populations and even an entire ecosystem. All these elements, starting from the organismal level, are able to exist independently, forming the corresponding levels of evolution, the highest manifestation of which is the biospheric rank.
It must be said that each biological system, despite the various constituent elements, is characterized by the following features:
- performs corresponding functions;
- she has a certain integrity;
- consists of separate subsystems;
- capable of adaptation, which is appropriate changes in response to various environmental influences;
- besides,the biological system is characterized by relative stability and ability to develop, constantly regenerate damaged components, as well as to complete or partial renewal and self-healing.
A relatively homogeneous biological system is the level of organization of the living, which is characterized by the appropriate type of interaction of elements, as well as spatial and temporal criteria for the processes that occur in it.
The concept of different levels of organization of living matter became widespread in the middle of the 20th century. It includes the differentiation of all life on the planet into separate discrete and interconnected structural groups.
It should be noted that the biological system is characterized by the principle of hierarchy - different levels of organization form a specific pyramid, in which each structural level is followed by the next one, but of a higher rank. At the same time, all levels of the organization interact and influence each other.
Since ancient times, biological systematics began to develop - a discipline whose goal is to develop separate principles for the classification of all living organisms that can be used to build biological systems.
Today, the classification of plants and animals is carried out according to the principle of hierarchy mentioned above: individual individuals - species that are combined into genera, - family - order or order - classes that form the correspondingdepartments - types that are part of the kingdoms. Thus, a particular plant or animal must fall into each of these seven classification categories.
A new concept is the term "superkingdom" or biological domain. Behind it, each biological system is also classified into superkingdoms of eukaryotes, bacteria or archaea.
It is worth noting that biological systems have a certain feature: living organisms are connected not only with each other, but also with the environment, which is manifested in the general exchange of energy, substances and information. Life without such interaction is impossible.
