Which was not an important advance made by the maya a devised an accurate map of the world b developed a 365 day calendar c independently developed the concept of zero d tracked cycles of the moon, planets, and stars, and predicted eclipses

The only thing that they did not do was make a map of the world, so I would pick A.

they are best described as reliable search engines.

ba geologist finds four sedimentary rock she determines that no geologic events have shifted the layers she labeles them a,b,c,dbfrom top to bottom