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Sagot :
Answer:
A. hydrogen
Nearly all organic compounds also contain H atoms, which explains why plants need the H they get from water molecules through photosynthesis. Hydrogen ions are vital in both aiding proton gradients to help drive the electron transport chain in photosynthesis, and for plant respiration.
#CarryOnLearning
Answer:
carbon dioxide
Explanation:
because carbon dioxide is needed for respiration
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