| to form their skeletons | 6 | purpose |
| from seawater | 4 | location |
| to some degree | 3 | other |
| coral → require → calcium | 4 |
| coral → use → calcium | 4 |
| coral → absorb → calcium | 4 |
| coral → need → calcium | 3 |
| negative | neutral | positive |
| 0.204 | 0.741 | 0.056 |
| Raw frequency | 15 |
| Normalized frequency | 0.375 |
| Modifier score | 0.900 |
| Perplexity | 189.275 |