The life expectancy has increased throughout the as of the way our life style has improved. There is better medical care and each year we learn more about diseases so we can prevent more deaths. Also sanitation and housing have improved. This is why the life expectancy has increased
Periodization is the division of time into periods that show some kind of characteristics, to facilitate the study of history. An example of periodization is distinguishing the Dark Ages as a period.
Among the options periodization is visible in b. dividing China's history based on which dynasty ruled the country.
D.United States
The US refused to join the League of Nations because of a philosophy that had long existed in America that is known as "Isolationism". The concept of Isolationism gradually evolved from the beginnings of the United States of America.
The answer is "D. Mediterranean".