biology

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Across
  1. 6. What do you compete in?
  2. 8. How did life originate?
  3. 9. What is a group of living organisms called?
  4. 10. What is transferred from a parent to an offspring?
  5. 11. What are the cells called that link up to either an animal or another human?
Down
  1. 1. What is the thread-like structure of nucleic acids called?
  2. 2. There are different ___________ of species.
  3. 3. What is it called when an animal changes to fit its environment?
  4. 4. What is the word for when an animal species is no longer on this Earth?
  5. 5. You ________ DNA off your parents when you're born?
  6. 7. What is an old rock called?