The lecture compares the United States (a highly developed country economically), Brazil (moderately developed), and Nigeria (not very developed economically). The broader point is that economic development greatly influences the characteristics of population. Low economic development is associated with what population characteristics? Group of answer choices low infant mortaility, low fertility and a large proportion of the population under age 15 high infant mortality, low fertility, and a moderate proportion of the population under age 15 high infant mortality, but also a high fertility rate, and also a higher proportion of population under age 15 High income per capita