Where do scientists believe the first human beings came from ?

Humans first evolved in Africa, and much of human evolution occurred on that ... Scientists do not all agree, however, about how these species are related or ... The field involves an understanding of the similarities and differences between humans and other species in their genes, body form, physiology, and behavior.

a system of cooperative federalism emerged, as the powers of the federal government expanded.

the russian revolution of 1917 involved the collapse of an empire under tsar nicholas ii and the rise of marxian socialism under lenin and his bolsheviks.