BIOLOGY

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Across
  1. 5. controls the activities of the cell
  2. 8. send messages and coordinate activity of the body
  3. 9. small and roughly spherical
  4. 10. two tubes that travel to the left and right lungs
  5. 12. double-layered covering
  6. 13. contract to allow movement
  7. 14. deliver oxygen to cells and remove carbon dioxide from cells
Down
  1. 1. Rod shaped formed by membranes
  2. 2. store calcium and build new bone
  3. 3. store energy in the form of fat
  4. 4. 2 air-filled, spongy organs
  5. 6. stores and contains food particles, waste materials, excess water
  6. 7. detect sound vibrations
  7. 11. closely stacked and flattened sacs
  8. 15. jelly-like substance