| Label | Id | |
|---|---|---|
| Geologic | Geologic | |
| Gills | Gills | |
| Glacier | Glacier | |
| Glands | Glands | |
| Grass | Grass | |
| Grasslands | Grasslands | |
| Groundwater | Groundwater | |
| Gut | Gut | |
| Gymnolaemates | Gymnolaemates | |
| Hindgut | Hindgut | |
| Host-associated | Host-associated | |
| Human | Human | |
| Hydrocarbon | Hydrocarbon | |
| Hypersaline | Hypersaline | |
| Hypolimnion | Hypolimnion |