| to our ecosystems | 7 | transitive-object |
| like improving disturbed soil | 7 | other |
| in the environment | 7 | location |
| lichen → be → important | 12 |
| lichen → make → critical contributions | 5 |
| lichen → play → important role | 3 |
| negative | neutral | positive |
| 0.033 | 0.372 | 0.594 |
| Raw frequency | 20 |
| Normalized frequency | 0.614 |
| Modifier score | 0.900 |
| Perplexity | 162.792 |