Answer:
In order to create the calendar, it involved much math to figure out what day it was and the time of day as well as when specific events occurred such as moon phases.
Also, the Mayans first created the calendar to know when they should farm their crops and work agriculturally.
It must be original because the jurisdiction do federal rial courts have to be original
Answer:
A prospective cohort study
Explanation:
A prospective cohort study -
It is a longitudinal study which a group of people with certain differences are studied , in order to determine how various factors affect the rate of the outcomes .
This method is adapted for studying various diseases , this method is a long run method , which is done for years to have complete and brief knowledge .
hence , from the question , Cancer study is done on the 3,000 adults of Baltimore , showing the example of a prospective cohort study .