Feeding the world crossword

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Across
  1. 3. helps the transaction of photosynthesis
  2. 4. the cell surface ? Controls what goes in and out of the cell
  3. 5. the earths atmosphere has this
  4. 7. how do plants make their own nutritients
Down
  1. 1. where photosynthesis take place
  2. 2. a stick liquid
  3. 6. plants don’t need this to grow