About 7000 years ago mexican indians improved the size of this crop's ears

Below you can find the About 7000 years ago mexican indians improved the size of this crop's ears Jeopardy Words Answer. The answer to About 7000 years ago mexican indians improved the size of this crop's ears has 4 letters. This clue belongs to the Ancient history category and is part of Jeopardy Word Level 1640. If you scroll near the bottom you will find other clues and answers part of level 1640