What are the typical characteristics of population in the different age groups?

Natality is the characteristic of population which means :

List any three important characteristics of a population and explain.

The given Bar Graph presents the percentages of population in the age groups. X(above 50 years), Y(20 to 50 years). Z(below 20 years) in five different villages. A,B,C,D and E with total population of 5000, 6000, 8000, 4500 and 6000 respectively The difference between the number of persons of ages below 20 years in villages D and E,taken together, is what percentage of the number of persons of the same age group in village D?

The given bar graph presents the percentages of population in the age groups X ,Y , Z in five different villages A,B,C,D and E total population of 5000,6000,8000,4500 and 6000 respectively. The number of persons having ages below 20 years in villages B and C taken together is what percentage of the total population of the said villages.