Giraffes were once either short-necked or long-necked. As soon as vegetation died, the giraffes that had the gene for long necks survived and passed their characteristics on to their offspring. This best illustrates:
a. natural selection
b. social Darwinism
c. psychosocial reproduction
d. the unconscious id
A. Natural selection suggests that the characteristics that promote survival are passed down in a species.
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In which of the following ethnic groups are gays and lesbians least likely to be "out"?
A. African American B. Native American C. Caucasian American D. Asian American
A person who always chooses the cooperative option in the prisoner’s dilemma will always receive the highest reward.
a. True b. False
These graphs are meant for use with categorical variables.
A. line graph B. pie chart C. bar graph D. scatterplot
Sierra's parents are amazed by her development. She has gone from rolling over to now sitting up by herself. Her parents are anticipating the day she will begin crawling around their apartment. If she follows the normal developmental milestones of an infant, Sierra is most likely ____.
A. 5 months of age B. 7 months of age C. 9 months of age D. 11 months of age