Photosynthesis

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Across
  1. 3. Animals breath out this gas
  2. 5. A substance that takes part in and undergoes change during a reaction.
  3. 7. The sun provides producers with this energy
Down
  1. 1. During a chemical reaction reactants are transform into
  2. 2. Our body is mainly made up of this
  3. 4. Plants produce this as a waste product
  4. 6. Another word for sugar