Answer:
They both created accurate calendars.
Step-by-step explanation:
The mayan and ancient Mesopotamian civilizations both had written language that was called cuneiform, and the Mayans had also a written language, they both also had city states, but only some Mayans continue today and they do not do it in the same way as they did back when the civilization flourished, so the only option that is actually true is that both civilizations created accurate calendars.