1.population trend

2.steadily

3.rapidly

4.migration

5.natural increase

6.net movement

7.immigrants

8.emigrants

9.ageing/aging population

10.life expectancy

11.sex ratio

12.bell-shaped

13.apex

14.distribution

15.density

16.economic development

17.relief

18.covernment planning

16,17,18 ask question(factors affecting population distribution)