Changes in fertility, mortality, and migration affect the __________, which refers to the biological and social characteristics of a population, including age, sex, race, marital status, education, occupation, income, and size of household.
a. occupational composition b. gender ratio
c. population composition d. rate of natural increase
Question 2
Which statement most accurately reflects the overall trends in life expectancy for middle- and low-HDI countries?
a. Life expectancies have been steadily b. Although some advances have been made, majordecreasing over the past several problems still exist.decades.
c. Life expectancy in middle- and low-HDI countries has risen to equal the rates in high-HDI countries, thanks to medical technology.
d. Severe life expectancy discrepancies exist because people in middle- and low-HDI countries possess inferior cultural practices regarding health care.
Biological investigation at different levels
Biological Information Flow
Poverty and Mortality
Biological control pits one organism against another
Total Fertility Rate in the United States, 1860–2008
Differences in yield between two wheat varieties at different soil fertility levels