Question

Compare the emergence of advanced civilizations in Meso and South America with the four early river valley civilizations.

The calendars produced by the Mayan and ancient Mesopotamian civilizations

were both accurate

are still used today

were based on the moon's cycles

never worked correctly

Answer 1

@DangerousJesse

Answer 2

@IMStuck

Answer 3

@AWall10

Answer 4

@Bookworm14

Answer 5

@Book_Nerd_101

Answer 6

@undeadknight26

Answer 7

@e.mccormick

Answer 8

i think they were based on the moon cycles

Answer 9

Actually, none of these are entirely true. Mayan calendars were based on the dates of completion of specific monuments, and were straightened out by the cycles of the moon.. But I'm guessing Bookworm is right.