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population(33)
density(14)
public health(14)
humidity(13)
lead(9)
forests(7)
pesticides(7)
population density(7)
precipitation(7)
urban areas(7)
lakes(6)
rural areas(6)
vegetation(6)
conductivity(5)
oxygen(5)
carbon(4)
coral reefs(4)
morbidity(4)
mortality(4)
ph(4)
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