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CrashCourse · 发布于 2013年1月1日
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 http://www.patreon.com/crashcourse Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse Instagram - https://www.instagram.com/thecrashcourse/ CC Kids: http://www.youtube.com/crashcoursekids
