AP BIOLOGY

Detailed explanation-1: -In plants with a C3 photosynthesis pathway, the first stable compound produced in photosynthesis contains three carbon atoms; in C4 plants, the first compound has four carbon atoms. The C3 pathway evolved first, functioning efficiently when the atmosphere was rich with carbon dioxide.

Detailed explanation-2: -Abstract. C4 plants evolved independently more than 60 times from C3 ancestors. C4 photosynthesis is a complex trait and its evolution from the ancestral C3 photosynthetic pathway involved the modification of the leaf anatomy and the leaf physiology accompanied by changes in the expression of thousands of genes.

Detailed explanation-3: -So the correct option is ‘Sugarcane’.