| Label | Id | |
|---|---|---|
| Ice | Ice | |
| Insecta | Insecta | |
| Integument | Integument | |
| Intestine | Intestine | |
| Intracellular | Intracellular | |
| Introitus | Introitus | |
| Invertebrates | Invertebrates | |
| Kidneys | Kidneys | |
| Lake | Lake | |
| Landfill | Landfill | |
| Lentic | Lentic | |
| Loam | Loam | |
| Lotic | Lotic | |
| Lumen | Lumen | |
| Lung | Lung |