People who have depression may have low levels of the neurotransmitter

A. dopamine.
B. acetylcholine.
C. serotonin.
D. GABA.


Answer: C

History

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Social class in eighteenth-century America was __________

A) nonexistent B) based on land monopoly C) based on economic rank D) similar to European aristocracy

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In Aristotle's world view, the sun, moon, planets, and stars all revolved in perfect circles around

What will be an ideal response?

History

Which dynasty formed a disastrous alliance with the Jurchens?

A) Sui B) Han C) Tang D) Song

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The Union of Soviet Socialist Republics was formed in 1922 by

a. joining Russia and the Soviet Ukraine. b. allying Russia, Georgia, and Lithuania. c. uniting Russia, Siberia, and Kazakhstan. d. unifying all communist provinces. e. a United Nations mandate.

History