What is one important achievement of the Incas?

A. a written language
B. a system of democratic government
C. a system of roads and bridges
D. an accurate calendar

What is one way in which the Incas increased their farmlands?

A.They developed crops suited to desert
B. They built floating gardens
(C.) They built terraces on the mountainsides
D. They flattened the mountains

Which crop was the most important to the Mayas?

(A.) corn
B. beans
C. squash
D. peppers

Which of the following was an achievement of the Mayas?

A. a system of canals in their main city
B. The city of Tenochtitlan
C. a calendar
D. a strong army

One way in which the Aztecs increased their farmland was by

A. using slash-and-burn agriculture
B. studying their year-round calendar
C. building island gardens
D. buying land from other peoples