Fill in the blank spaces given to complete each sentence.

1. ……….. is considered to be the ultimate resource.
2. More than 90% of the world’s population resides on just …………… percent of the total land surface.
3. The top ten countries in population cover about …………. per cent of the total world population.
4. ……….. is the most populated country in North America.
5. The world’s population reached a billion in the year ………….
6. Birth rate and death rate are usually expressed in terms of per ………… people.
7. The difference between the ……… and the ………… is called natural growth rate of population.
8. The age group 0-15 comes under the economically ………….. group.