To measure whether older people are calmer than younger people, a researcher gives 20-year-olds, 40-year-olds, and 60-year-olds a questionnaire. this research technique is called a(n): a. correlational study. b. longitudinal study. c. experiment. d. cross-sectional study.

In some zoos, rare crosses between a male lion and a female tiger have produced hybrid offspring called "ligers." male ligers are sterile but some female ligers are fertile. in the wild, lion and tiger ranges do not naturally overlap, making such a cross unlikely. furthermore, the solitary behavior of tigers and the social organizations of lions create behavioral differences. the production of sterile male ligers is an example of read the following scenario to answer the following question. in some zoos, rare crosses between a male lion and a female tiger have produced hybrid offspring called "ligers." male ligers are sterile but some female ligers are fertile. in the wild, lion and tiger ranges do not naturally overlap, making such a cross unlikely. furthermore, the solitary behavior of tigers and the social organizations of lions create behavioral differences. the production of sterile male ligers is an example of a postzygotic barrier the founder effect sympatric speciation a prezygotic barrier

If both the president and the vice president can no longer serve, who will become the next head of state?

Thomas more's fictional text about a society governed by reason and order is most likely a response to the conflict between a)the king and church leaders b)male and female leaders c)rulers of other nations d)royalty and the working class