B1，B2

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Across
  1. 2. the ability to detect and respond to changes in the environment
  2. 5. make more of the same kind of organism
  3. 7. increase in size
  4. 8. Stores cell sap
  5. 11. Where photosynthesis happens.
  6. 12. an action by an organism causing a change of position or place
  7. 13. Contains DNA
Down
  1. 1. Join amino acids together to make proteins
  2. 3. Taking in materials for energy growth and development
  3. 4. Where most chemical reactions happen
  4. 6. It is made of cellulose. It supports the cell and strengthens it
  5. 9. Holds the cell together and controls what goes in and out
  6. 10. Removal from organisms of toxic material and waste