Hank continues our exploration of animal phyla with the more complexly organized annelida and arthropoda, and a biolography on insects. Like CrashCourse on Facebook: www.facebook.com/YouTubeCrashCourse Follow CrashCourse on Twitter: www.twitter.com/TheCrashCourse References: www.sciencedaily.com/releases/2010/07/100726222316.htm tlc.howstuffworks.com/home/earthworm-appreciation-day.htm annelidsf.blogspot.com/ www.bukisa.com/articles/41743_amazing-facts-about-arthropods#ixzz1sXW1Jigp www.ehow.com/about_6292974_interesting-crustaceans.html crashcourse, crash course, biology, complex animals, annelid, arthropod, segmentation, evolution, diversity, chordate, vertebrate, ancestor, earthworm, beetle, anatomy, synapomorphy, chaetae, shared traits, trait, plesiomorphy, worm, leech, phyla, class, insect, scorpion, butterfly, lobster, thorax, exoskeleton, chitin, jointed feet, cheliceriformes, arachnid, myriapoda, biolography, pollination, flowering plants, flight, metamorphosis, nymph, pupae, crustacea, shrimp, crab Support CrashCourse on Subbable: subbable.com/crashcourse

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