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Mesoamericans were polytheistic ; their gods possessed both male and female traits and demanded blood sacrifices of enemies taken in battle or ritual bloodletting . Corn , or maize , domesticated by 5000 BCE , formed the basis of their diet . They developed a mathematical system , built huge edifices , and devised a calendar that accurately predicted eclipses and solstices and that priest-astronomers used to direct the planting and harvesting of crops . Most important for our knowledge of these peoples , they created the only known written language in the Western Hemisphere ; researchers have made much progress in interpreting the inscriptions on their temples and pyramids . Though the area had no overarching political structure , trade over long distances helped diffuse culture .
Please check all the words that can be used instead of the target word in the same context. Note that the morphology of the target (third person singular, past tense etc.) is considered to be applied to the candidate automatically in the process of paraphrasing.