When studying the average number of children that are born to each woman in a country (assuming the mother lives to the end of her childbearing years), a researcher is studying the country’s .
A.
infant mortality rate
B.
maternal mortality rate
C.
childhood obesity rate
D.
total fertility rate

in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".

the roman army grew in size and became dominant in the mediterranean region.