The first known people to calculate the circumference of the earth were the: egyptians greeks romans western europeans

Restricting immigrants from entering a country may be based on what belief?  

Suppose that sociologists and cultural anthropologists are tying to measure the amount of child abuse for cross cultural comparison. they run into disagreement over whether spanking a child is abuse or discipline. what problem are they encountering in their research? a. reliability of the definition of abuse. b. validity of the definition of abuse. c. occam's razor about the definition of abuse. d. none of these.

In the three centuries from ad1100 to ad1400 many changes took place in western