The answer is D, religion was very important to them.
Russia taking control of Eastern European countries.
Pagers were invented in 1949 by Al Gross well the first telephone pager but it wasn't until 1956 when the motorola company creates the first portable paging device.
ANSWER: Indus Valley
Many historians believe the Indus civilization collapsed because of changes to the geography, climate of the area, halted trade with Mesopotamia, and Aryan invasions.