UNIT 2 - Evolution Crossword Puzzle

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Across
  1. 6. When a species dies out, it becomes __________.
  2. 8. Theory that species change over time
  3. 9. Type of selection in which females choose the best traits
  4. 11. A characteristic that helps an organism survive
  5. 15. The process by which new species are formed
Down
  1. 1. Requirement for new species to form
  2. 2. All organisms that reproduce together and create fertile offspring
  3. 3. An organism's ability to survive and reproduce many offspring
  4. 4. Structures that have no current function and have disappeared or become much smaller
  5. 5. Structures that prove common ancestry and which share a similar structure
  6. 7. A random change in DNA
  7. 10. Type of selection that is determined by humans
  8. 12. A trait that is not genetic
  9. 13. Structures that share the same function by different structures
  10. 14. Type of selection that is determined by the environment