Category: Population and the Environment

A. cosmopolites
B. ethnic villagers
C. urban villagers
D. the trapped

A. they are produced by techniques of cross-breeding
B. they are capable of drastically improving agricultural yields
C. they involve transplanting genes between different organisms
D. they have become front-page stories in the news everyday

A. falls in agricultural yields
B. the spread of disease
C. the use of unclear energy
D. a rise in sea levels

A. relatively open class systems
B. extensive social mobility
C. a much more rigid division of labor by gender
D. all of the above