| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| closed and open circulatory system | 1.73 | 0.3 | 9433 | 91 | 34 |
| closed | 1.61 | 0.1 | 981 | 99 | 6 |
| and | 1.95 | 1 | 9160 | 70 | 3 |
| open | 0.67 | 0.3 | 7294 | 70 | 4 |
| circulatory | 1.95 | 0.8 | 1557 | 37 | 11 |
| system | 1.27 | 0.6 | 7930 | 52 | 6 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| closed and open circulatory system | 1.31 | 0.8 | 499 | 63 |
| open and closed circulatory system difference | 0.53 | 0.5 | 9505 | 94 |
| open circulatory system vs closed | 0.49 | 0.1 | 583 | 24 |
| earthworm circulatory system open or closed | 0.33 | 0.4 | 8976 | 67 |
| echinoderms circulatory system open or closed | 1.76 | 0.3 | 4075 | 73 |
| annelida circulatory system open or closed | 0.55 | 0.2 | 854 | 32 |
| mollusca circulatory system open or closed | 0.5 | 0.2 | 6430 | 96 |
| open vs closed circulatory systems | 1.62 | 0.9 | 4532 | 80 |
| difference open closed circulatory system | 0.51 | 0.9 | 3836 | 41 |
| open circulatory system and closed | 0.31 | 0.7 | 7530 | 24 |
| circulatory system open or closed | 0.25 | 0.3 | 9614 | 12 |
| open and closed circulatory systems | 0.12 | 0.4 | 7199 | 41 |
| open vs closed circulatory system advantages | 0.45 | 0.6 | 2734 | 26 |
| closed circulatory system is present in | 1.82 | 0.3 | 2471 | 88 |
| describe open circulatory system | 1.1 | 0.4 | 8445 | 15 |
