| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| sea urchin respiratory system | 1.92 | 0.5 | 420 | 67 | 29 |
| sea | 0.17 | 0.8 | 5763 | 30 | 3 |
| urchin | 1.87 | 0.5 | 1058 | 6 | 6 |
| respiratory | 0.67 | 0.9 | 172 | 92 | 11 |
| system | 0.13 | 0.5 | 7322 | 69 | 6 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| sea urchin respiratory system | 0.84 | 0.4 | 5515 | 51 |
| sea urchin water vascular system | 1.33 | 0.3 | 5851 | 99 |
| how do sea urchins respire | 0.16 | 0.3 | 5986 | 94 |
| do sea urchins do cellular respiration | 0.98 | 0.4 | 6771 | 28 |
| sea urchin internal anatomy | 1.86 | 0.2 | 2085 | 24 |
| anatomy of sea urchin | 1.82 | 0.3 | 9178 | 50 |
| sea urchin role in ecosystem | 0.12 | 0.5 | 6847 | 28 |
| the sea urchin immune system | 1.41 | 0.5 | 6591 | 99 |
| describe sea urchin anatomy | 0.79 | 0.8 | 8303 | 9 |
| sea urchins digestive system | 1.42 | 0.3 | 553 | 96 |
| describe sea urchin ecology | 0.26 | 0.7 | 4752 | 35 |
| sea urchin air plant | 0.95 | 0.6 | 4679 | 81 |
| functions of sea urchins | 1.45 | 0.4 | 5293 | 59 |
| what is sea urchin | 1.45 | 1 | 9692 | 83 |
| describe sea urchin gastronomy | 1.9 | 1 | 7892 | 64 |
| information about sea urchins | 0.25 | 1 | 6714 | 67 |
| ecological importance of sea urchins | 1.82 | 0.1 | 3908 | 42 |
