Findings from contemporary research on aging and intelligence suggests that adults who cognitively engage themselves more in challenging jobs, or with intellectual hobbies, fair better in terms of the maintenance of their intelligence throughout middle and late adulthood. this finding fits best with which theory of successful aging?

An externality can be created by a. people working at a production job and enjoying their work b. a production activity but not a consumption activity c. a consumption activity but not a production activity d. a production activity or a consumption activity externalities a. are always positive, and an example is flu vaccinations b. are always negative, and an example is the pollution created by trucks c. can be negative or positive. logging has a negative externality, and education has a positive externality d. can be negative or positive. a negative externality is having to go to school when you would rather go to the beach, and a positive externality is spending time with your friends

What caused the settlement of more african americans in the mississippi alluvial plain region than in the ozark mountains point)

Most of the workers who laid the central pacific railroad were?