1. Levels of Organization

2. atom
atom is the smallest particle that maintains its physical and chemical properties; note that particles smaller than the atom have been discovered, but they do not maintain these properties

3. molecule
when two or more atoms are bonded together

4. macromolecule
when two or more molecules are bonded together to form large (gigantic!) molecules
Lipids

5. organelles
several macromolecules bonded together form these building blocks of a cell

6. Below this level begins what scientists consider living or alive

7. cells
the smallest unit of life, a cell is a collection of organelles functioning together

8. tissues
a collections of cells working together to perform a specific job

9. organs
two or more types of tissues that work together to complete a specific task

10. organ systems
several organs working in unison to achieve a common goal

11. organism
several organ systems functioning together

12. population
groups of individual organisms of the same species working together to achieve a common goal

13. community populations of different species of organisms
A community is the set of all populations that inhabit a certain area.
Communities can have different sizes and boundaries.

14. ecosystem
groups of different populations living in the same environment
the community plus its physical environment.
include both the biotic and abiotic parts of an environment
An ecosystem can be as large as the Sahara Desert, or as small as a puddle or a pond

15. Deciduous Forest Biome
a collection of ecosystems with similar climates – biomes are determined by rainfall amounts.
a biome can be thought of many similar ecosystems throughout the world grouped together.
Coral Reef
Deciduous Forest Biome

16. Biomes of the World

17. biosphere The surface of earth as far out as life can be supported.
All of the biomes on the planet earth