Use any two of the following - Scale (Size, how large it was), genius (the brains behind it, the idea to create it), physical effort (what it took the Maya to create it, the work that went into making it) and significance (what it allowed the Maya to do) - to describe what is so remarkable about the Mayan development of a calendar system.

Mayan civilization lasted for more than 2,000 years, but the period from about 300 A.D. to 900 A.D., known as the Classic Period, was its heyday. During that time, the Maya developed a complex understanding of astronomy. They also figured out how to grow corn, beans, squash and cassava in sometimes-inhospitable places; how to build elaborate cities without modern machinery; how to communicate with one another using one of the world’s first written languages; and how to measure time using not one but two complicated calendar systems.Maya historians have generally settled on a combination of three main factors which could have caused the Maya collapse: warfare between city-states, overpopulation, and drought

Explanation:

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The answer would be political systems .