specialized cells grade 6

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Across
  1. 4. the pigment inside red blood cells
  2. 7. red blood cells don't have a _______
Down
  1. 1. the cells that carry electrical signals
  2. 2. a very long string of cytoplasm electrical signals can move through
  3. 3. the cells found in plant leaves
  4. 5. the sticky substance that traps bacteria and dust
  5. 6. each cell type is adapted to do a specific ______