Heredity & Adaptation Crossword Puzzle

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Across
  1. 3. a vertebrate with four limbs
  2. 6. a living thing
  3. 9. the variety of life-forms that exist on Earth
  4. 11. selective breeding
  5. 15. a scientist who studies fossils
  6. 16. to change
  7. 17. the basic unit of heredity carried by the chromosomes; codes for proteins which determine the traits of an organism
Down
  1. 1. the period of time ranging from the formation of Earth about 4.6 bya to today
  2. 2. an organism related to an organism that lived earlier
  3. 4. all the fossils on Earth
  4. 5. the passing of traits from parent to offspring
  5. 7. a random change in an organism's DNA
  6. 8. the study of genes and how they affect the traits of an organism
  7. 10. a rock made from parts of an organism such as bones or teeth
  8. 12. any trait of an organism that increases its chances of surviving and reproducing
  9. 13. any remains, trace, or imprint of animal or plant life preserved in Earth's crust
  10. 14. an evolutionary tree diagram based on shared characteristics