| Biology Chapter 5: Biodiversity and Conservation | 10 | October 9, 2012 |
| Biology Chapter 15: Evolution | 28 | July 11, 2012 |
| Biology Chapter 14: The History of Life | 17 | July 11, 2012 |
| Biology Chapter 12: Molecular Genetics | 19 | July 11, 2012 |
| Biology Chapter 11: Complex Inheritance and Human Heredity | 13 | July 11, 2012 |
| Biology Chapter 10: Sexual Reproduction and Genetics | 21 | July 11, 2012 |
| Biology Chapter 9: Cellular Reproduction | 19 | July 11, 2012 |
| Biology Chapter 7: Cellular Structure and Function | 35 | July 11, 2012 |
| Biology Chapter 5: Biodiversity and Conservation | 20 | July 11, 2012 |
| Biology Chapter 3: Communities and Biomes | 31 | July 11, 2012 |
| Biology Chapter 2: Principles of Ecology | 30 | July 11, 2012 |
| Biology Chapter 8: Cellular Energy | 19 | July 11, 2012 |
| Biology Chapter 4: Population Ecology | 12 | July 11, 2012 |
| Biology Chapter 6: The Chemistry of Life | 40 | July 11, 2012 |
| Biology Chapter 1: The Study of Life | 29 | July 11, 2012 |