Who was the pioneer in quantum mechanics who created the "uncertainty principle"?
A. Ernst Abbe
B. Paul von Hindenburg
C. Werner Heisenberg
D. Erwin Schrödinger
Answer: C
History
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Muhammad was born into the ________ tribe
A) Abbasid B) Quraysh C) Umayyad D) Fatimid
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Which religion took root in West Africa in the eleventh century?
A) Christianity B) Buddhism C) Islam D) ancestor worship
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Urban populations in Sumerian cities typically reached ________
A) 10,000 B) 1,000 C) 100,000 D) 1 million
History
As the West expanded, conflicts erupted
A. with Native Americans. B. among competing communities of Euro-Americans. C. with Chinese workers. D. All these answers are correct.
History