| from an external source | 8 | other |
| through photosynthesis | 2 | manner |
| ecosystem → require → energy | 7 |
| ecosystem → use → energy | 4 |
| ecosystem → need → energy | 4 |
| ecosystem → provide → energy | 3 |
| negative | neutral | positive |
| 0.053 | 0.740 | 0.207 |
| Raw frequency | 18 |
| Normalized frequency | 0.508 |
| Modifier score | 1.000 |
| Perplexity | 293.846 |