Early Earth Life

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Across
  1. 4. the first animals that left the ocean for land
  2. 6. Era where bacteria formed
  3. 7. Era where complex life began to form
  4. 9. animals without a backbone
  5. 11. one of the first life forms still alive today
Down
  1. 1. the majority of early life was this: did not move
  2. 2. evidence of an organism, why we have so much proof of Paleozoic era
  3. 3. blue green algae, first to take in sunlight
  4. 5. responsible for mass extinction, and changing of the Earth
  5. 8. the earliest life forms relied on this energy to survive
  6. 10. process that cyanobacteria used to make energy