The Levels of Organization is a term used in basic biology, anatomy, and physiology. It is used with five basic concepts, the smallest the cell. Many specialized cells make up a tissue, many tissues an organ, many organs an organ system, and finally, many organ systems an organism. In bizarre cases microorganisms (unicellular) and superorganisms, only one cell or many organisms may occur within a single species or organism.
Level I(correction): Chemical
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Cells are the basic building blocks(basic unit)of life and performs vital functions in an organism, stated in Cell Theory.
Tissue, the second level of organization. It is created by joining cells that have similar function or structure.
An organ is a group of tissues that perform a specific function or groups of functions. This is the third level of organization.
An organ system is a collection of organs that perform a specific function- the circulatory system or digestive system for example. Several organ systems are present in humans and other creatures have different kinds of systems. Plants have vascular systems and sharks have a kind of "electromagnetic system". An organ system cannot live by itself and is dependent on other organ systems to form an organism. Here is a list of human organ systems and the organs they are made up of:
Organ systems may be closely intertwined and called things like the musculoskeletal system or neuroendocrine system.
An organism is a being thats able to perform simple acts of survival. We humans are one for example. This is the fifth and last level of organization.
A Community is a group of interacting living organisms sharing a populated environment.