Living Environment Translated Arabic 2014 | Page 28

All living organisms are made up of cells.
g. Multicellular organisms have a specific system of
organization:
1. Cell- the smallest unit of an organisms
2. Tissue- a group of cells that work together to perform
a specific function
3. Organ- a group of tissues that work together to
perform a specific function
4. Organ-System- ( System) – a group of organs that
work together to perform a specific function
5. Organism- a complete living thing