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  1. Cambrian explosion - Wikipedia

  2. Cambrian explosion | Evolution, Paleontology & Geology

  3. The Rise of the First Animals - Scientific American

  4. Cambrian Period & Cambrian Explosion: Facts & Information - Live Science

  5. Cambrian Period—541 to 485.4 MYA - U.S. National Park Service

  6. 27.4: The Evolutionary History of the Animal Kingdom

  7. Cambrian Explosion - Biology Encyclopedia - body, animal, …

  8. Tiny ancient worm sheds big light on evolution mystery

  9. New Oxford study sheds light on the origin of animals

  10. Cambrian Period | National Geographic