Biology

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Across
  1. 2. Blood vessel carrying blood away from the heart
  2. 5. Smallest unit of living things
  3. 6. Pair of organs where gas exchange happens
  4. 7. A group of cells working together to do the same function
  5. 8. Pumps blood around the body
Down
  1. 1. Process that uses oxygen and glucose to release energy
  2. 3. Equipment used to view small things
  3. 4. Structure in the cell which controls what the cell does