| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| oxygen levels 45 | 1.62 | 0.8 | 1700 | 40 | 16 |
| oxygen | 1.54 | 0.3 | 4875 | 74 | 6 |
| levels | 1.17 | 0.2 | 3526 | 9 | 6 |
| 45 | 0.95 | 0.2 | 670 | 88 | 2 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| oxygen level 45 | 0.83 | 0.1 | 5979 | 17 |
| oxygen level 45% | 1.79 | 0.9 | 7762 | 35 |
| oxygen levels 65 million years ago | 1.62 | 0.4 | 2281 | 71 |
| oxygen levels 50% | 1.31 | 0.5 | 5938 | 71 |
| oxygen levels 59 | 1.66 | 0.8 | 6400 | 75 |
| oxygen levels 4 gas meter | 0.26 | 0.3 | 2817 | 94 |
| oxygen level 65% | 0.41 | 0.9 | 3521 | 7 |
| oxygen level 65 means | 1.75 | 0.6 | 2830 | 26 |
| blood oxygen level 45 | 1.01 | 0.7 | 2808 | 85 |
| historic oxygen levels on earth | 1.46 | 0.4 | 6082 | 73 |
| oxygen levels earth history | 0.12 | 0.2 | 7442 | 45 |
| earth's oxygen levels history | 1.18 | 0.3 | 4983 | 91 |
| oxygen a four billion year history | 0.23 | 1 | 6589 | 19 |
| oxygen levels in the 70s | 0.76 | 0.7 | 7224 | 3 |
| how long has oxygen been around | 1.17 | 0.5 | 2694 | 15 |
| highest oxygen levels in earth history | 0.63 | 0.5 | 8969 | 38 |
| oxygen levels by age | 1.74 | 0.2 | 8342 | 93 |
| when did oxygen levels start to decline | 0.45 | 0.1 | 7397 | 71 |
| oxygen levels in the 80s | 0.4 | 0.1 | 3292 | 74 |
