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population(4)
biomass(3)
surface water(3)
carbon(2)
conservation(2)
nitrogen(2)
vegetation(2)
absorption(1)
ammonia(1)
desertification(1)
fertilizers(1)
gravity(1)
gravity wave(1)
gravity waves(1)
humidity(1)
invasive species(1)
irrigation(1)
lakes(1)
mortality(1)
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