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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. 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 Crash Course is on Patreon! You can support us directly by signing up at Want to find Crash Course elsewhere on the internet? Facebook - Twitter - Instagram - CC Kids:
