Which of the following was an achievement of the mayan civilization? development of a river-borne trade network development of roads and bridges development of cold-storage techniques development of astronomy and mathematics

The Mayan civilization had their own math mathematics which is an achievement for any civilization. The Mayan's also really cared about astronomy, when ever a celestial event happend  they beleaved  it was God communicating with them.

SHORT ANSWER: development of astronomy and mathematics.

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photos creat an ovveral image of the civil war