Worthy White Crossword ch. 16/17

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Across
  1. 3. Structures that serve no function
  2. 5. Fertilized egg
  3. 8. Both ends of the curve have a higher fitness than the middle
  4. 10. History of life documented by fossils
Down
  1. 1. What is used to determine the age of fossils
  2. 2. middle of the curve has higher fitness
  3. 4. Structures that are similar in structure but different in function
  4. 6. Any change in a sequence of DNA
  5. 7. When chance can cause alleles to become less or more common
  6. 9. Bodily structures that are similar in function but not in structure