Life Ch-Ch-Ch-Changes
- Listening: The Second Great Lesson
- The Timeline of Life: Precambrian through Devonian
- Precambrian Period
- Cambrian Period
- Ordovician Period
- Silurian Period
- Devonian Period
- Reviewing: The Second Great Lesson
- The Timeline of Life: Carboniferous through Cretaceous
- Carboniferous Period
- Permian Period
- Triassic Period
- Jurassic Period
- Cretaceous Period
- Retelling: The Second Great Lesson
- The Timeline of Life: Paleocene through Holocene
- Paleocene Epoch
- Eocene Epoch
- Oligocene Epoch
- Miocene Epoch
- Pliocene Epoch
- Pleistocene Epoch
- Holocene Epoch