Hank introduces us to ecology - the study of the rules of engagement for all of us earthlings - which seeks to explain why the world looks and acts the way it does. The world is crammed with things, both animate and not, that have been interacting with each other all the time, every day, since life on this planet began, and these interactions depend mostly on just two things... Learn what they are as Crash Course Biology takes its final voyage outside the body and into the entire world. Stay tuned in the coming weeks for a new Crash Course in ECOLOGY! Like CrashCourse: www.facebook.com/YouTubeCrashCourse Follow CrashCourse: www.twitter.com/TheCrashCourse Table of Contents 1) Ecological Hierarchy 02:01:2 a) Population 02:12 b) Community 02:26:1 c) Ecosystem 02:50 d) Biome 03:22:1 e) Biosphere 03:51 2) Key Ecological Factors 04:07 a) Temperature 05:06:1 b) Water 05:37 3) Biome Type 06:03:1 References/Image Licenses: dft.ba/-2qQ3 crash course, biology, ecology, hank green, science, organism, interaction, molecule, environment, hierarchy, Earth, ecological, population, community, predation, cooperation, competition, ecosystem, soil, water, air, temperature, energy, materials, physical environment, biome, technique, adaptation, condition, evolution, biosphere, biotic, abiotic, predator, animal, plant, food, shelter, moisture, sunlight, elevation, category, chemistry, enzyme, photosynthesis, physiognomy, biodiversity, tropical rainforest, tundra, desert, grassland, taiga, human impact Support CrashCourse on Subbable: subbable.com/crashcourse

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