bunga ng pagunlad ng kalakan
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bunga ng pagunlad ng kalakan
bunga ng pagunlad ng kalakan
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Umunlad ito dahil napakaraming tao ang dapat pakainin at damitan. Para naman tugunan ito, nagkaroon ng pangangailangang magpalitan ng produkto, pagkain, inililikha sa Iba't-ibang lugar.