Aztecs irrigated and reclaimed swampland so that they could farm.
<u>Explanation</u>:
Aztec refers to people of Central Mexico speaking Nahuatl. The Aztecs were known for introducing irrigation, agriculture and cultivating the land. These people involved in draining swamps and creating artificial islands in the lakes. The artificial island is used for farming.
Aztecs were involved in building pyramids and temples. They learned irrigation to change their habits. Farming became their major occupation. Hieroglyphic writing was introduced by Aztecs. Complex calendar system was implemented and used by Aztecs.
The Columbian exchange was the arrival of new species in the Old and the New Worlds. Among the many species that arrived in the New World were the bacteria and viruses that were causing many illnesses but to which the Old World people were immune. The Native Americans were not immune so many of them, by some estimates even 90 %, died.
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