BIOMES
| Date | Clue |
|---|---|
| 2025-10-08 | Tundras and deserts, e.g. |
| 2022-06-04 | Savanna and tundra |
| 2016-05-03 | Wetlands and tundra, e.g. |
| 2012-12-26 | Ecological communities |
| 2012-08-26 | Ecologists' study |
| 2007-12-30 | Rain forests and grasslands, e.g. |
| 2005-12-04 | Ecological units |
| 2003-10-11 | Some complex communities |