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 a. were both accurate b. are still used today c. were based on the moon's cycles d. never worked correctly

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he was able to speed up production of the processing of seeds

the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.