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Biology, 05.02.2020 06:48 mariap3504

Which statement best describes a human influence on the biogeochemical cycles?

a) increased eutrophication caused by high levels of nitrogen and phosphorous
b) increased nitrates available due to inaccurate methods of denitrification
c) increased global warming due to alternative energy sources
d) increased amount of water that is available to freshwater ecosystems

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