Hydrogen has been placed at the top of the first column of the periodic table. Hydrogen does not share most of the properties of elements in this column. Hydrogen is placed in this position partly because it does share one property with these elements, an outermost shell that contains — A. zero valence electrons
B. one valence electron
C. Two valence electrons
D. three valence electrons​

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

Which groups of people most directly benefited from song innovations in the song dynasty‘s open border policy?

What is federalism? what is federalism