science crossword 3000

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Across
  1. 3. keeps a human body active, food creates it
  2. 4. change food into energy
  3. 6. thinking, centre of information
  4. 7. blood, tubes, oxygen transportation
  5. 8. breaking down food
Down
  1. 1. lifeline blood
  2. 2. excretory, circulatory, digestive
  3. 4. fitness, workout
  4. 5. respiratory, oxygen, breathing