Evolution Crossword Puzzle

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Across
  1. 3. minor differences in the traits of individuals in a species
  2. 5. facts that support a claim
  3. 7. feature or characteristic
  4. 8. possible explanation of an observation with much supporting evidence
  5. 9. type of fossil that is a preserved body, or part of the body, of a dead organism
  6. 13. to observe the similarities and differences between two things
  7. 14. how genes are passed on from parents to offspring
  8. 16. type of fossil that results when a mold fossil fills with minerals that harden into rock
  9. 17. change over time
  10. 18. "___ structures"; body parts of different species that have similar structure but different function
  11. 19. "___ structures"; body parts of different species that have similar function but different structure
Down
  1. 1. "environmental ___"; something that makes it more difficult for an organism to survive
  2. 2. "common ___"; a species from long ago from which two or more modern species descended
  3. 3. "___ structure"; body part that has lost its original use through evolution
  4. 4. "___ selection"; a theory about how evolution works
  5. 6. type of fossil that is preserved evidence of living activity of organisms
  6. 10. scientist who began development of the theory called natural selection
  7. 11. preserved evidence of long dead organisms
  8. 12. study of the structure or internal workings of something, usually an organism
  9. 15. type of fossil that is an imprint of the body, or part of the body, of an organism