During the course of the nineteenth century—that is, from the early 1800s to the late 1800s—the rate of narcotic addiction in the United States:
A. increased
B. decreased
C. remained the same
D. fluctuated wildly and erratically from year to year
E. cannot be estimated
A. increased
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_______________ may occur because of mistakes made when DNA copies itself during cell divisions or because of environmental factors such as ultraviolet radiation from the sun
a. Mutations b. Noncoding DNA c. Epigenetics d. Twins
Research supports that many gay men are homosexual because they unconsciously fear women
Indicate whether the statement is true or false
ECT is usually administered in a series of 6 to 12 treatments over a period of several ______
a. hours c. weeks b. days d. months
Three-month-old Winston will probably listen longer to ________ than to ________
A) pure tones; voices B) pure tones; noises C) human speech; nonspeech sounds D) a foreign language; his native language