Which constraint complicates efficient C4 photosynthesis in prolonged drought?

💡 Explanation

Limited water forces stomatal closure, preventing CO₂ entry needed by C4 plants, because carbon fixation depends on a constant CO₂ supply via PEP carboxylase, therefore reduced transpiration hinders C4 more than C3 plants, rather than affecting PEP transport directly.

• Which physiological outcome occurs when a hibernating woodchuck experiences sudden ambient temperature rise?
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