Photosynthesis and Respiration
In oxygenic photosynthesis, water is split in order to provide the

electrons needed for cyclic photophosphorylation
electrons needed to reduce P680
O2 needed for the dark reactions
electrons needed to reduce NADH

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Photosynthesis and Respiration
Which of the following statements about energy metabolism is false?

The energy that powers living systems ultimately comes from the sun
Plants provide the water and CO2 that animals need to carry out respiration
All animals in some way rely on plants for their energy
All eukaryotic organisms carry out respiration in the presence of O2

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