BC means before Christ while AD means after the birth of Christ, the one key difference between counting years in BC and AD is when you count time in BC the years decrease as you approach AD on the timeline.
Answer:
an emperor of Russia before 1917. tsar Nicholas 2
Explanation:
a person appointed by government to advise on and co-ordinate policy In a particular are' the former British drugs czar.'
An example is A: Identifying the major rivers of the United States.
The answer is the first one
