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 Follow CrashCourse on Twitter: www.twitter.com References: www.sciencedaily.com tlc.howstuffworks.com annelidsf.blogspot.com www.bukisa.com www.ehow.com 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
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