Here are the answers to the given questions above. 1. The group that is considered as the very powerful and the best educated in Aztec society is the priests. 2. The key belief or practice in the Aztec Religion is this: Human sacrifice supplied a diet of blood for Aztec gods. The answer is the second option. 3. The one who eventually invaded and conquered the Aztec Empire are the Spanish soldiers and their native allies. Hope this helps.