1. Levels of Organization

2. Unicellular Organisms
Single cell performs all life functions.
It functions independently.

3. Multicellular Organisms
Have various levels of organization
Individual cells within the organism perform specific functions but they must also work together for the good of the entire organism
The cells become dependent on each other

4. Multicellular Organism Organization

5. Level 1
Cells
The basic unit of structure and function in living things
Serves a specific function with organism
Examples – blood cells, nerve cells, etc

6. Level 2
Tissues
Made of cells similar in structure and function that work together to perform a task
Four basic types – connective, epithelial, muscle and nervous

7. Level 3
Organs
Made up of tissues that work together to perform an activity

8. Level 4
Organ Systems
Groups of 2 or more organs that work together to perform a specific function for the organism
Humans have 11 systems

9. Level 5
Organisms
Entire living things that can carry out all basic life function.
Usually made up of organ systems, but can be a single cell also