9. Prior to the Columbian Exchange, exposure to infectious disease was more common in Europe than the Americas primarily due to
A) superior hygienic practices in Native American societies
B) Europe's larger population
C) the use of inoculation by Native Americans to combat the spread of disease
D) Europe's smaller geographical size

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

Compare and contrast the philosophies of constitutionalism and the divine right of kings. which has the greatest impact in the formation of the us constitution?

"people are the greatest resource that a country has". justify.