| liquid oxygen | 6 |
| dissolved oxygen | 4 |
| supplemental oxygen | 4 |
| pure oxygen | 3 |
| free oxygen | 2 |
| molecular oxygen | 2 |
| extra oxygen | 1 |
| singlet oxygen | 1 |
| combine with hydrogen | 0.60 |
| produce co2 | 0.60 |
| enter the enamel | 0.60 |
| enter dentin | 0.60 |
| bleach colored substanc… | 0.56 |
| pass into the bloodstre… | 0.56 |
| produce water | 0.55 |
| enter lung | 0.55 |
| provide energy | 0.55 |
| enter the blood | 0.55 |
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| rainforest | 0.25 |
| photosynthetic microbes | 0.25 |
| eight protons | 0.59 |
| an oxidation state of -1 | 0.52 |
| 8 electrons | 0.52 |
| eight neutrons | 0.51 |
| six valence electrons | 0.38 |
| negative charge | 0.37 |
| track-up | 0.33 |
| button | 0.33 |
| gaseous stream | 0.31 |
| octet | 0.28 |
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| prescription | 0.28 |
| ammonia | 0.31 |
| whiter smile | 0.28 |
| organ damage | 0.27 |
| the formation of water | 0.25 |
| respiratory failure | 0.19 |
| fetal heart failure | 0.16 |
| heart disease | 0.16 |
| cell death | 0.16 |
| gas | 0.64 |
| element | 0.50 |
| colorless, odorless gas | 0.44 |
| the fuel | 0.43 |
| the third most abundant… | 0.42 |
| the most abundant eleme… | 0.40 |
| essential element | 0.38 |
| tasteless gas | 0.34 |
| life | 0.33 |
| oxidizer | 0.33 |
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| removed | 0.75 |
| absorbed | 0.73 |
| released | 0.72 |
| administered | 0.71 |
| consumed | 0.68 |
| delivered to the patient | 0.65 |
| produced by photosynthe… | 0.65 |
| produced by plant | 0.64 |
| reduced | 0.63 |
| depleted | 0.63 |
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