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Which risk increased when early maize agriculture expanded onto steeper terrain?

A)Accelerated topsoil erosion downslope
B)Increased nitrogen fixation efficiency
C)Decreased average kernel weight
D)Greater resistance fungal infestations

💡 Explanation

Surface runoff increased, triggering soil loss because the lack of terracing meant that the *sheet erosion* mechanism stripped away the topsoil as water flowed downhill. Therefore, erosion was accelerated, rather than nitrogen fixation increased or kernel size/infestation impacts worsened.

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