1. how did the rulers of the mayans, aztecs and incas maintain such great power over their people?
2. what geographic and environmental factors made farming difficult for the mayans, incas, and aztecs?

3. what was the purpose of human sacrifice for the aztecs?

4. what were some of the general religious practices of each american civilization?

1.  A common religion was one of the biggest reasons. Followed by "Divine Right" part of religion where rulers ruled by the divine right given to them by their chief God, as a direct descendant of the God. And third control of the trade route.

2. At one location near Mexico City, an entire field of vegetable bulbs were unearthed beneath a solidified lava flow.

3. These sentences refer to the ritual of human sacrificed practiced by the Aztec priests. The Aztec believed that they owed everything to the gods who created themselves as well as the world around them. The would perform sacrifices in order for a good crop yield or good weather among other things.

4. Some of the general religious practices of each American civilization included, festivals which most commonly occurred during important agricultural periods. Common practices were, worship and thanks given to the Great Spirit for protection and survival. Many also believed that every object was spirit, or "wakan." Religious practices were later influenced by Christianity

i would go with the last one

the answer to your question is true