Aztecs were located in south Mexico, so life was very warm and dry lots of deserts and not much water near them.. Also hunting was a huge part of Aztec culture so was farming and other natural properties....
Dont completely take my word for it, but I think it might be geographic studies, Best of luck to you on the test!!
The introduction of the horse to North America by the Spanish changed the lives of Native Americans, because A) Pacific Northwest Indians could hunt buffalo more efficiently. This made it easier for the Native Americans to hunt their buffalo in a more precise and organized manner, due to the way they could round the buffalo up.