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← HistoryWhich outcome decreased the harvest index for ancient Mesoamerican maize when terrace wall instability increased?
A)Enhanced stem vascular transport
B)Increased leaf photosynthetic area
C)Reduced grain allocation fraction✓
D)Improved root nutrient uptake
💡 Explanation
Erosion reduces the available arable land via terracing, reducing grain yields from maize. Because the plants experienced greater resource stress, reducing the plants' overall grain allocation fraction, rather than enhancing other metabolic pathways or uptake, was the primary outcome; therefore, the harvest decreased.
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