1. Levels of Organization of Life
Ecosystem
Molecule
Biome
Organ system
Biosphere
Community
Tissue
Atom
Cell
Organism
Organ
Population
Organelle

3. 1.
Atom
Smallest part of an element that has the properties of that element
Example: carbon, hydrogen, oxygen

4. 2 Molecule Two or more atoms together
Example: Water (H2O), carbon dioxide (CO2)

5. 3 Organelle Part of cell that carries out a specific job
Mitochondria, nucleus

6. 4
Cell
Basic unit of life
Example: skin cell, nerve cell

7. 5
Tissue
Group of cells with a special job
Muscle tissue

8. 6
Organ
Group of tissues with a specific job
Heart, kidney

9. 7 Organ system Group of organs that work together
Circulatory system, respiratory system, nervous system

10. 8
Organism
A living thing
Human, elephant

12. 9
Population
Group of organisms living in an area
Herd of elephants

13. 10 Community All the living things (populations) that live in an area
Elephants, lions, shrubs, zebras

14. 11 Ecosystem All the living things and the nonliving things in an area
Example: all the zebras, elephants, lions and the water, temperature/climate, etc.

15. 12 Biome Region on earth with characteristic life and climate
Examples:

16. 13 Biosphere The collective area of Earth that supports life.
Example: Air, land, water

18. Levels of Organization of Life
Atom
Molecule
Organelle
Cell
Tissue
Organ
Organ system
Organism
Population
Community
Ecosystem
Biome
Biosphere