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 How is this determined?
How is this determined?
| water 555 tropical 261 fish 232 Pacific Ocean 92 fishes 88 freshwater 82 environment 71 Indian Ocean 70 winter 61 climate change 58 summer 54 lead 52 Greenland 49 Chlorophyll 42 oscillation 40 nitrogen 39 salt 37 Northern Hemisphere 35 cod 35 precipitation 33 pollution 33 cyanobacteria 32 Mercury 32 Southern Hemisphere 32 salmon 31 CO2 31 | Carbon dioxide 30 Nutrients 29 Nitrate 27 blood 26 eggs 24 Iron 23 emissions 21 algae 20 antarctica 20 tuna 20 skin 17 pesticides 14 ozone 13 Egg 13 Leucine 12 Cadmium 12 Cholera 11 biodiversity 11 DDT 11 continental shelf 11 Lipids 10 Seafood 10 Amino acids 10 Phosphorus 10 Arsenic 10 |