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population(2)
surface water(2)
ammonia(1)
community dynamics(1)
conservation(1)
elements(1)
estuaries(1)
glaciers(1)
heat(1)
humidity(1)
lakes(1)
macrophytes(1)
nitrogen(1)
ph(1)
precipitation(1)
public health(1)
rural areas(1)
solar radiation(1)
tides(1)
urban areas(1)
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