Here's a breakdown of how cells organize:

* Cell: The basic unit of life.

* Tissue: A group of similar cells working together to perform a specific function (e.g., muscle tissue, nervous tissue).

* Organ: A structure made of different tissues that work together for a common purpose (e.g., heart, brain).

* Organ System: A group of organs that work together to carry out major bodily functions (e.g., digestive system, circulatory system).

* Organism: A complete living being made up of all these levels of organization.