| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| internal gas exchange | 1.28 | 1 | 619 | 32 | 21 |
| internal | 0.17 | 0.2 | 6712 | 53 | 8 |
| gas | 0.5 | 0.2 | 6289 | 34 | 3 |
| exchange | 0.65 | 1 | 6413 | 92 | 8 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| internal gas exchange | 0.12 | 0.6 | 1513 | 54 |
| internal gas exchange occurs | 1.69 | 0.3 | 2886 | 48 |
| internal and external gas exchange | 0.79 | 0.2 | 7965 | 99 |
| where does internal gas exchange occur | 0.35 | 0.2 | 7470 | 7 |
| internal vs external gas exchange | 1.06 | 0.7 | 8035 | 44 |
| internal respiration vs gas exchange | 1.52 | 0.5 | 4287 | 58 |
| internal respiration is gas exchange between | 1.87 | 0.4 | 2969 | 49 |
| internal gas exchange occurs where | 1.52 | 0.1 | 9205 | 77 |
| gas exchange occurs in | 0.72 | 0.8 | 3391 | 15 |
| which occurs as part of gas exchange | 1.71 | 0.6 | 546 | 17 |
| gas exchange occurs by the process of | 0.98 | 0.8 | 1833 | 18 |
| ultimately gas exchange occurs where | 0.26 | 0.9 | 5806 | 78 |
| where specifically does gas exchange occur | 1.28 | 1 | 9465 | 42 |
| gas exchange takes place in the | 0.95 | 1 | 5316 | 40 |
| exchange of gases occurs in | 0.51 | 0.4 | 5365 | 73 |
| by what process does gas exchange occur | 0.81 | 1 | 3946 | 22 |
| explanation of gas exchange | 1.52 | 0.1 | 2079 | 27 |
| describe the process of gas exchange | 0.02 | 0.5 | 5838 | 2 |
| in which structure does gas exchange occur | 1.82 | 0.7 | 2039 | 56 |
| where does the gas exchange happen | 0.48 | 1 | 3708 | 50 |
| the process of gas exchange is | 1.44 | 0.1 | 2638 | 28 |
