C4 photosynthesis A) is advantageous because RUBP carboxylase has a high affinity for CO₂. B) is advantageous because PEP carboxylase has a high affinity for CO₂. C) the stomata can remain open during the day. D) evolved just once. E) none of the above

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C4 photosynthesis is advantageous because PEP carboxylase has a high affinity for CO2, allowing plants to efficiently fix carbon even under low CO2 conditions.

C4 Photosynthesis