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 How is this determined?
How is this determined?
| water 106 soil 30 Calcium 25 Nitrate 20 Phosphorus 19 lead 19 radiation 14 pollution 13 environment 12 nitrogen 12 pregnancy 10 grassland 10 blood 10 summer 10 calcium carbonate 9 Iron 9 sodium 9 Sugar 9 Clover 9 Thiamine 9 Nutrients 9 ozone 9 Asthma 9 Silica 8 winter 8 precipitation 8 | Chlorophyll 8 hydrogen 8 Diuron 8 Minerals 8 Tumor 8 Vitamin 8 Montmorillonite 8 Mouth 8 Egg 7 herbicides 7 CO2 7 cod 7 Cellulose 7 agriculture 7 bones 7 watercress 7 wheat 7 Glucose 7 eggs 6 Magnesium 6 Radium 6 Mercury 6 Seeds 6 drought 6 freshwater 6 |