What Is Life? 2nd Edition by Jay Phelan

تمرين 17

A primary difference between the age pyramids of industrialized and developing countries is that:
a) mean longevity is significantly greater in developing countries.
b) in developing countries, much larger proportions of the population are in the youngest age groups.
c) developing countries show a characteristic "bulge" that indicates a baby boom.
d) in developing countries, females live significantly longer than males, whereas in industrialized countries the reverse is true.
e) developing countries have significantly more individuals than industrialized countries.