Rank the achievements from 1(most significant) to 6 (least significant) -Aztec Chinampas
-Aztec Causeways
-Incan Suspension Bridges
-Incan Terraces
-Mayan Calendar
-Mayan Step-Pyramids

Incan Suspension Bridges - 6

While not necessarily easy to build, they are not much different from a standard hanging bridge.

Incan Terraces - 5

They are not easy to build whatsoever, but not that difficult either. This can be demonstrated by the fact that similar terrances can be seen in other regions of the world like China and Southeast Asia.

Aztec Chinampas - 4

They are basically floating plots of land, like a miniature version of modern day Dutch polders. They were a great feet of Aztec engineering.

Mayan Step-Pyramids - 3

Mayan Step-Pyramids are great feats of Mayan architecture and engineering, and professionals from this area still wonder at them.

Aztec Causeways - 2

This were the canals built in the lake of Texcoco, that connected the Aztec capital: Tenochtitlan, with its sorrounding.

Mayan Calendar - 1

A feat of Mayan mathematics, astronomy, and even numerology, the Mayan Calendar continues to wonder scientists to this day.

a)scientists

explanation:

the national defense education act had two main goals. the first one was to provide personal that was oriented to defense, including scholars, engineering students and so on. the other goal was to provide financial assistance for the students who would be enrolling at colleges and universities in the 1960s.