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population density(22)
mars(12)
urban areas(12)
predation(11)
biomass (ecology)(9)
sediment(9)
climate change(8)
foraging(8)
habitats(8)
ionosphere(8)
reefs(8)
species diversity(8)
animal migration(7)
forests(7)
coral reefs(6)
death rates(6)
grasslands(6)
trees(6)
conservation science(5)
magnetic reconnection(5)
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