| Clue | Source | Date |
|---|---|---|
| Savanna and tundra | Universal | 06 May 2025 |
| Desert, tundra, etc. | ||
| Savanna, taiga, etc. | LA Times Daily | 01 Sep 2024 |
| Rain forests and grasslands, say | ||
| Endlessly huge, some special ecological communities (6) | ||
| Taigas and deserts | USA Today | 16 Nov 2023 |
| Ecological communities | LA Times Daily | 12 Feb 2023 |
| Ecological regions | Newsday | 05 Jan 2020 |
| Large ecosystems | Universal | 01 Dec 2017 |
| Forest and desert, e.g | Premier Sunday | 09 Jul 2017 |
| Large ecosystems | ||
| Wetlands and tundra, e.g | New York Times | 03 May 2016 |
| Ecological communities | Universal | 19 Nov 2015 |
| Ecological communities | ||
| Ecological communities | ||
| Ecologists' study | ||
| Ecological communities | ||
| Rain forests and grasslands, e.g. | ||
| Ecological complexes | ||
| Ecological units | ||
| Ecological complexes | ||
| Some complex communities |