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Free learning from The Open University www.open.edu --- This video examines just how critical microbes are to life on Earth with their role in nitrogen fixation -- providing the essential elements that we need to survive. (Part 4 of 7) Playlist link - www.youtube.com --- Study 'Biology' at the Open University: www3.open.ac.uk Study 'Empire of the microbes' with the OU www3.open.ac.uk ---
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