12 words of biology

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Across
  1. 4. Form a unit of genetic code
  2. 5. A natural appendage
  3. 6. A pair of parallel helices
  4. 8. A group of organs that work together
  5. 11. Its intended purpose
  6. 12. has a specific vital function
Down
  1. 1. Preventing something from happening
  2. 2. The end of an event or process
  3. 3. Specialized cells
  4. 7. The smallest unit of an organism
  5. 9. Inherited from parents
  6. 10. Organization of parts to form an organ