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Read the passage and answer the question.
When Spanish conquistador Hernando Cortez arrived near the Rio Grande River, he noticed the local population growing crops such as avocados, corn, garlic, nuts, onions, pumpkins, tomatoes, and chili peppers. The people living in this area also created irrigation systems used in some drier regions. The Aztec farmers were known for making a particular type of terraced garden. This was done to utilize rainfall in the best way possible and to minimize erosion. We know they used crop rotation and natural fertilizers to help their farm products grow better.
Which of the following is an appropriate heading for this paragraph?