natural selection

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Across
  1. 5. seasonal movement of animals
  2. 6. a resting state in a plane
  3. 7. a mechanism of evolution
  4. 11. animals that aren't built for survival
  5. 12. all the animals in the ecosystems
Down
  1. 1. humans choosing what to breed
  2. 2. all people born and living at the same time
  3. 3. an organism adapting to its environment
  4. 4. a change or difference in organisms
  5. 8. a large group of organisms
  6. 9. the tissue in plants conducts water
  7. 10. the process of mutating