What is an organism?

The body is one of the main subjects of study of the science of biology. Back in school, we learn that an organism is a living body that has properties that distinguish it from inanimate matter. However, the definition of the organism does not end there. After all, organisms can be very complex forms of life. In this article we will look at what an organism is, what it consists of and what organisms are.

The difference between a living organism and a non-living

To understand what an organism is, one must first understand its differences from inanimate nature. The main difference of living organisms from non-living is metabolism. It includes food, excretion, breathing.

Also, the difference from the inanimate nature of living organisms is heredity and variability, perception and processing of information, growth, development and reproduction.

Types of organisms

At present, it is customary to divide living organisms into multicellular and unicellular organisms (prokaryotes, eukaryotes). Separately, you can select viruses. Consider each of these types of organisms in more detail.

Unicellular organisms

These are called organisms that consist of a single cell. Share on eukaryotes and prokaryotes. And the first are the majority of bacteria, fungi and microscopic organisms.

  • Primary organisms (prokaryotes). They do not possess a cell nucleus, they also lack any organoids. Moreover, they have a type of nutrition that is characteristic of plants - photosynthesis. Many bacteria and blue-green algae are attributed to prokaryotes. These include microbes - living organisms that have dimensions that prevent them from being seen with the naked eye. As a rule, such organisms have a size less than one tenth of a millimeter. And among the microbes often include microscopic fungi. Microbiology is the study of microbes.
  • Nuclear organisms (eukaryotes). These include living organisms that contain a nucleus in their cells. Animals, plants and fungi are eukaryotic organisms (amoeba, euglena, ciliates, chlorella, yeast).

Multicellular organisms

These organisms include those that consist of a variety of cells. Moreover, these cells have different composition and function.These include intestinal cavities, flatworms, round and annelids, arthropods, sponges, clams, chordates.


Viruses are currently classified as living organisms difficult. After all, it is known that a living organism is called such an organism that is capable of independent reproduction. While viruses can multiply only in living cells. However, now on this topic in the scientific world is still under discussion.

Human organism

The human body is considered to be the most complex of all existing living organisms. It consists of many systems, organs, which include not only living cells, but also organelles.

In anatomy, the human body is considered to be the physical structure formed by the multitude of cells that make up the tissues that make up the organs, as well as the skin.

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