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Biogeochemical Cycles part 3- Oxygen and Carbon cycles

I've taken two weeks to make this video! It has been one of the longest slide i've made untill now, but I think my effort was awarded: the video is very nice!

I hope you find it funny and useful for your knowledge :D The last biogeochemical cycle will be about phosphorus cycle, so, see you next time ( I don't know when! ^_^ )

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