| enter the lake | 0.64 |
| work with calcium | 0.57 |
| build bone | 0.49 |
| enter river | 0.47 |
| move in the soil | 0.45 |
| build tooth | 0.45 |
| use energy | 0.42 |
| enter lake erie | 0.39 |
| enter stream | 0.39 |
| enter the water | 0.35 |
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| eutrophication | 0.28 |
| toxic algae blooms | 0.25 |
| compound | 0.40 |
| protein | 0.28 |
| an oxidation number of … | 0.25 |
| element | 0.53 |
| essential element | 0.52 |
| solid | 0.38 |
| never found as free ele… | 0.25 |
| used in fertilizer | 0.67 |
| released | 0.58 |
| taken up by plant | 0.57 |
| obtained | 0.57 |
| added | 0.53 |
| mined | 0.52 |
| produced | 0.44 |
| recovered | 0.42 |
| returned to the soil | 0.42 |
| absorbed | 0.40 |
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