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4 votes
Photosynthesis cannot be completed without:

oxygen
carbon
water
sugar

User Seungmin
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2 Answers

7 votes
Water and carbon dioxide! A plant needs carbon dioxide to respire (breathe) but it needs water to feed itself and turn into energy :)
User Jeremy Castelli
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2 votes
Water!

Photosynthesis produces sugar and oxygen, and doesn't require or produce carbon, thus it must be water.
User Aepryus
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