evolution

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Across
  1. 6. beginning of existence
  2. 9. energy released in the form of particle
  3. 11. survival and reproducion
  4. 13. a group of species separate from others
  5. 14. remains of plants and animals
  6. 15. organism adjusted to their environment
Down
  1. 1. the separation of species by physical barriers like water forms
  2. 2. a thought out explanation
  3. 3. development is marked by isolation
  4. 4. a change in a living organism
  5. 5. having the same structure
  6. 7. variety of life on earth
  7. 8. structures that have no apparent function
  8. 10. medium sized bird
  9. 12. organism adjust to new environment