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mars(8)
population density(8)
ionosphere(4)
thermosphere(4)
habitats(3)
temperature(3)
urban areas(3)
amphibians(2)
aurora(2)
chlorophyll(2)
climate change(2)
comet(2)
coral reefs(2)
corals(2)
ecological niches(2)
ecosystems(2)
equation of state(2)
exosphere(2)
forests(2)
frogs(2)
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