What was the main factor spurring the evolutionary development from australopithecines to homo habilis some 2.5 million years ago?
a. environmental charges
b. alien technology
c. development of agriculture and dietary changes
d. ingestion of excessive amounts of mercury
e. crossbreeding with other australopithecines species
a
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The contradiction between the concept that "all men are created equal" and the existence of slavery caused which of the following?
A. Some slaves in the North petitioned their state governments for freedom. B. Slaves in several northern states rose in rebellion against the institution of slavery. C. Northerners accepted the idea of the equality of the races. D. All northern states abolished slavery by 1800.
The nineteenth-century empires were marked by a shift of focus __________.
A. from the Americas to Asia and Africa B. from Africa to the Americas C. from Asia to the South Pacific D. toward the Middle East
The stock market crash of 1929 was ________ days long
Fill in the blank(s) with correct word
The 2008 Olympics indicated that China's attitude towards foreigners and towards criticism ________
A) had changed radically B) remained the same C) was changing slowly D) had undergone a revolution