evolution

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