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 How is this determined?
How is this determined?
| water 70 fish 27 environment 16 summer 10 tropical 9 pollution 7 climate change 7 nitrogen 6 radiation 6 lead 6 freshwater 6 Pacific Ocean 6 Chlorophyll 5 biodiversity 5 fishes 5 oscillation 4 Nutrients 4 winter 4 Greenland 4 Toxicity 4 oil spill 3 carbon cycle 3 copper 3 heavy metals 3 algae 3 CO2 3 | soil 3 cyanobacteria 3 Tongue 3 continental shelf 3 Toxicology 3 hydrogen 3 chlorella 3 Chelating 3 Polysulfides 3 biogeochemical cycles 2 coral reef 2 mussels 2 ocean currents 2 Minerals 2 tuna 2 Nitrate 2 evolutionary history 2 global change 2 kelp 2 Indian Ocean 2 Nitrite 2 Rabies 2 Iron 2 salmon 2 shrimp 2 |