Natural Selection

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Across
  1. 2. Crocodiles and Lizards are both?
  2. 5. To hide of disguise yourself
  3. 8. Flightless bird who has been extinct due to natural selection?
  4. 9. The surname of the man who contributed to the idea of Evolution?
  5. 10. When an organism no longer exists?
Down
  1. 1. The largest living species of Tortoise
  2. 3. ......... of the fittest?
  3. 4. The First name of the man who contributed to the idea of Evolution
  4. 6. Elephants are said to have evolved from?
  5. 7. To develop gradually to adapt to it's surroundings