Chapter 3 Test

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Across
  1. 4. non- life threatening
  2. 6. high to low
  3. 7. membrane protective covering
  4. 9. line up in center
  5. 10. Brain of cell
  6. 15. protective protein
  7. 16. a liquid is brought
Down
  1. 1. material outside cell
  2. 2. Nucleus disappears
  3. 3. cancerous tumors
  4. 5. made of dense fibers
  5. 8. no energy required
  6. 11. living environment
  7. 12. solid particles
  8. 13. infectious particles
  9. 14. energy required