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Across
  1. 2. What is citrus fruit rich in
  2. 3. something butter is rich in
  3. 5. black compound found in tobacco smoke
  4. 9. a nutrition that repair tissues
  5. 10. what are plants known as in the food chain
  6. 11. A process that oxygen is used to break degiestion
  7. 14. accumulation of biomass along a food chain
  8. 15. a mineral needed for strong bones
  9. 16. a toxin use to kill animals and fungal pe
  10. 18. habitat found in a tree
  11. 19. tropical forest in the sea
  12. 20. environment that support life
Down
  1. 1. waste products or anerobic respiration
  2. 4. A kind of carbohydrate made by plants using
  3. 6. dilute solution of calcium hydroxide
  4. 7. very dry area with little water
  5. 8. what nutrient are potato rich in
  6. 12. addictive drug found in cigarettes
  7. 13. a way to measure obesity
  8. 17. Brain of cells