3, it is not a length of time, it is a group
Answer:
Complex Calendars.
Explanation:
The Mayans were one of the first to create calendars, using observatories to take note of the stars and how they "rotated the earth". Using such, they could determine the approximate time as well as seasons.
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To prevent workers from organizing strikes and stopping production
Because they are mostly being showed propaganda promoting the personality of Kim Jong. And he doesn’t want them knowing the truth about him
