Here's the arrangement of levels of cellular organization from simplest to most complex:

1. Cell: The basic, fundamental unit of life.

2. Tissue: A group of similar cells that work together to perform a specific function.

3. Organ: A structure made up of different tissues that work together to perform a complex function.

4. Organ System: A group of organs that work together to perform a major bodily function.

5. Organism: A complete living being made up of multiple organ systems.