| Episode |
3-2-1 Contact Big/Small: How Big is Big? |
1980 |
| Episode |
3-2-1 Contact Growth/Decay: Sex and Seeds |
1980 |
| Episode |
3-2-1 Contact Food/Fuel: Animal Food |
1980 |
| Episode |
3-2-1 Contact Big/Small: Animal Sizes/Scaling |
1980 |