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population density(152)
forests(60)
urban areas(49)
habitats(47)
climate change(42)
predation(41)
seasons(41)
conservation science(36)
sediment(35)
land use(34)
trees(34)
biomass (ecology)(32)
ionosphere(32)
mars(31)
rivers(28)
species diversity(28)
china(26)
coral reefs(26)
ecosystems(26)
death rates(25)
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