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Watch Crash Course Biology Season 2 Episode 17 Online

  • 1.5/10
  • COUNTRIES: United States of America
  • Subtitles: English

Crocodiles, and birds, and dinosaurs—oh my! While classifying organisms is nothing new, phylogeny— or, grouping organisms by their evolutionary relationships—is helping us see life in a whole new light. In this episode of Crash Course Biology, we’ll learn why this kingdom-phylum stuff is going out of style and why phylogenetic trees are in.