This increase in seed size probably results from the continuous use of water through irrigation.

The Moche pottery also provides insights into the agriculture of the inland valleys. Nineteen races of maize are found on Moche jars. Nine of these include the Peruvian races Confite Iqueiio, Confite, Morocho, Kculli, Enano, Perla, Mochero, Pagaladroga, Huancavelicano, and Perlilla, which had evolved by a.D. 800. Ten races identified are found today only outside Peru from Chile, Colombia, Ecuador, and Venezuela. This dispersal suggests that the prehistoric ranges of these races were wider than is known in present times. In fact, the Moche pottery shows that most maize forms had a wider geographical distribution prehistorically than they have today. Ceramic maize replicas on Moche jars demonstrate evidence that the north coast of Peru was a major center for cultural exchange and connected the distant areas of South America perhaps extending as far as Central...
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