When paleontologists refer to the "big five," to what are they referring? the five most influential organisms that have now become extinct. the five most influential mass extinctions in earth's history. the five most influential events that have changed the surface of the earth. the five most influential inventions that have allowed them to study mass extinctions

Suggest two reasons why irrigation is important for human development of the desert (4 marks)

Match your vocabulary word to its definition. 1. emigration 2. immigration 3. migration 4. overpopulation 5. sustainable development 6. under population 7. unsustainable development 8. urbanization the movement from one place to another the number of people exceeds the available natural resources in an area leaving one's homeland to settle in a new place the increase in the population of a city the movement of people to a new country the ability to meet current needs without reducing the ability to meet future needs resources being used up at a faster rate than they can be replenished birth rate insufficient to replace the existing population

Many rivers in central asia come from