| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| internal respiration vs gas exchange | 0.91 | 0.6 | 5849 | 40 | 36 |
| internal | 0.98 | 0.4 | 2638 | 25 | 8 |
| respiration | 0.88 | 0.9 | 34 | 68 | 11 |
| vs | 1.15 | 0.1 | 3530 | 94 | 2 |
| gas | 0.29 | 0.1 | 991 | 3 | 3 |
| exchange | 1.72 | 1 | 8595 | 37 | 8 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| internal respiration vs gas exchange | 1.19 | 0.4 | 6867 | 83 |
