The arching of the back exhibited by a female rat during copulation is known as ______.
A. receptivity
B. pronation
C. lordosis
D. attraction
Answer: C
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Mortality is a problem in research because _____
a. when subjects drop out, we don't know exactly how the results are affected b. without random assignment, the experimenter can't control who is in which group c. it means the comparison group was never equivalent to the treatment group d. when subjects die, the researcher could be named in a lawsuit
According to ethnic trends in adolescent sexual activity, which of the following teenagers is likely to have sex at the earliest age?
A. Maria, who is Latina B. Chad, who is White C. Wen, who is Korean D. Chantel, who is African American
Men and women often argue because of differences in communication styles
a. True b. False
In vitro fertilization, or IVF, has improved in recent years. What is the current rate of success of IVF in women under 35?
a. 15% b. 40% c. 55% d. 75%