The correct answer is the following.
Match the following Maya, Aztec, and Inca inventions to the effects they produced.
Rope bridges - helped the Incas travel long distances and communicate with their neighbors.
The pyramid at Chichen Itza - helped the Maya view astronomical
phenomena such as eclipses with the naked eye.
Chinampas - helped the Aztec farm more productively.
Prehispanic civilizations such as the Aztecs, the Mayas, and the Incas were some of the most important and stronger civilizations in Mesoamerican times and South American times.
The Aztecs built impressive "chinampas," where they built their homes and grew crops in small portions of land in the water canals that connected the great capital city of the empire: Tenochtitlan.
The Mayas were great astronomers and built observatories in Chichen Itza, one of the most important cities in the Yucataán Peninsula.
The Incas were the dominant civilization in South America, they built Machu Pichu at the top of the Andes mountains.