The best response that captures the similar environmental and cultural impacts of the Aztec and Inca is:
They both altered their environment for farming and introduced language.
This response highlights the significant agricultural innovations both civilizations implemented to adapt to their diverse environments, as well as their contributions to language and culture within their respective regions. The Aztecs developed chinampas (floating gardens), while the Incas used terracing and irrigation systems to maximize agricultural output. Additionally, both regions had complex language systems that influenced their societies and communication.