The world’s population in 2000 was 6 billion. Assuming a constant growth rate of 2 percent, in what year would the world population be 12 billion?

Which of the following characterize the historical move toward urbanization? i. increase in pollution ii. increase in frequency of natural disasters iii. increase in incidence of infectious disease a. i b. ii c. i and ii d. i and iii e. i, ii and iii