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Natural Selection - Crash Course Biology #14

Hank guides us through the process of natural selection, the key mechanism of evolution. Table of Contents: 1) Natural Selection 1:27 2) Adaptation 2:56 3) Fitness 3:36 4) Four Principals 3:54 a. Variations 4:01 b. Heritability 4:17 c. "The Struggle for Existence" 4:25 d. Survival and Reproductive Rates 5:00 5) Biolography 5:59 6) Modes of Selection 7:40 a. Directional Selection 8:17 b. Stabilizing Selection 8:56 c. Disruptive Selection 9:27 7) Sexual Selection 10:22 8) Artificial Selection 11:24 References: http://curiosity.discovery.com/topic/... http://www.globalchange.umich.edu/glo... http://blogs.scientificamerican.com/o... http://www.aibs.org/bioscience-press-... http://faculty.clintoncc.suny.edu/fac... http://www.irac-online.org/about/resi... http://www.pbs.org/wgbh/evolution/lib... http://evolution.berkeley.edu/evolibr... This video uses the following sounds from Freesound.org: "20071104.forest.04.binaural.mp3" by dobroide "ForestBirds.wav" by HerbertBoland Crash Course is on Patreon! You can support us directly by signing up at   / crashcourse   Want to find Crash Course elsewhere on the internet? Facebook -   / youtubecrashcourse   Twitter -   / thecrashcourse   Instagram -   / thecrashcourse   CC Kids:    / crashcoursekids