Levels of Organization............


The cell is the basic unit of structure and function of a living thing.


Groups of cells that work together to do a specific job in the Body


Sum of all cells, tissues, organs and organ systems makes an organism.


a part of an organism that is typically self-contained and has a specific vital function, such as the heart or liver in humans.

Organs System

The human body is made up of several organ systems that work together as one unit.