1. Levels of Biological Organization

2. Abiotic (non-living)
1. Atom = the smallest part of an element made of protons, electrons, and neutrons
Example = carbon, hydrogen, oxygen, nitrogen

3. Abiotic (non-living)
2. Molecules = two or more atoms chemically joined together
Examples = O2, CO2, H2O

4. Abiotic (non-living)
3. Organelle = a small part inside a cell that has a specific job to do
Examples =vacuoles, nucleus, ribosomes

5. Biotic (living)
4. Cell =the basic unit of structure and function in living things
Examples = white blood cell, skin cells, red blood cells, onion skin cell

6. Biotic (living)
5. Tissue = many cells of the same type working together for a common function
Examples = skin tissue, muscle tissue

7. Biotic
6. Organ = several different tissues working together to form a structure with a specific function
Example = heart, lungs, stomach, skin (largest organ)

8. Biotic
7, Organ System = a group of different organs working together to perform a major function for an organism
Example = Respiratory system, digestive system

9. Biotic
8. Organism = a single living things that has all the characteristics of life
Examples = dog, person, tree, bacteria, mushroom, paramecium

10. Biotic
9. Population = many organisms of the same kind (species) in the same place and at the same time.
Example =herd of cows, flock of geese

11. Biotic
10. Community = all of the different kinds of organisms in the same place at the same time.
Example = white tail deer, gray squirrel, white oak tree, red maple tree in Lion’s Park.

12. Biotic
11. Ecosystem = all the living things and all the non-living things in the same place at the same time
Example = pond ecosystem

13. Biotic
12. Biome = a region of the earth’s surface with a specific climate characterized by certain plants and animals
Example = desert, grassland, tundra

14. Biotic
13. Biosphere = the part of the earth where living things can be found (underground, in water, in the air, on earth’s surface)
Example = earth