Online College Courses for Credit

4 Tutorials that teach Levels of Organization
Take your pick:
Levels of Organization

Levels of Organization

Author: Nathan Lampson

This lesson will present the levels of organization of living things.

See More


Organisms and components of organisms are seperated into levels of organization so that they can be referenced.  For example, a group of squirrels living in an area together can be called a population of squirrels.  Likewise, all of the organisms that interact with one another in and around a lake can be called a biological community.


all ecosystems on earth


a biological community and all of its non-living surroundings

Example: All of the organisms in Eastern South Dakota as well as the non-living things surrounding them like shade, air temperature, and rainfall.


populations of organisms that coexist in an area

Example: All of the organisms in Eastern South Dakota.


group of one type of organism living in an area together

Example: All of the pheasants living in Eastern South Dakota.


individual living thing

Example: One pheasant.

Organ System

groups of cells that share a specialized function

Example: The circulatory system of a pheasant.


smallest functional unit of life

Levels of Organization