Organisms and biological classification

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Across
  1. 4. anything that causes a reaction in a organism
  2. 5. the study of naming and classifying organisms
  3. 6. strand of DNA enclosed in a protein coat
  4. 8. there are _ levels in classification
  5. 9. a plant cell, like a seed, that can make a new plant
  6. 10. an organism that can feed itself
Down
  1. 1. the most basic living unit
  2. 2. invertebrates that have a hard outer shell
  3. 3. the ability to resist infection again
  4. 7. a protein that protects cells from a virus