Hank describes the desperate need many organisms have for nutrients (specifically nitrogen and phosphorus) and how they go about getting them via the nitrogen and phosphorus cycles. Like Crash Course! www.facebook.com/YouTubeCrashCourse Follow Crash Course! www.twitter.com/TheCrashCourse Table of Contents Nitrogen Cycle 1:46 Nitrogen Fixing Bacteria 2:32 Nitrifying Bacteria 3:24 Denitrifying Bacteria 4:34 Phosphorous Cycle 5:16 Lithosphere 5:27 Plants 5:56 Animals 5:56 Decomposers 5:56 Aquatic & Marine Ecosystems 6:24 Sedimentation & Weathering 6:55 Synthetic Fertilizers 7:23 References and image licenses for this episode can be found in the Google document here: dft.ba/-3fDT Support CrashCourse on Subbable: subbable.com/crashcourse

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