Which of the following statements best describes the effects of natural selection?
Species are eliminated, or "selected," one-by-one over thousands of years, and no new species are developed.
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New species are naturally developed only every 2,000 years, and all previously existing species die out.
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Species change over short periods of time, in spurts, and this change occurs roughly every 1,000 years.
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Species change little by little with each generation, and over a long period of time they can develop into new species.
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Species change little by little with each generation, and over a long period of time they can develop into new species.
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Mimi is recovering from serious back surgery and has been taking pain medication for the last several days. She has received multiple phone calls from friends and family
Later that week, off her medication, she can't seem to remember the names of anyone who called her. Which of the following provides the best explanation for her memory failure? A) context-dependent learning B) state-dependent learning C) retroactive interference D) proactive interference
A social group of people viewed as competitors, enemies, or different and unworthy of respect is a(n) ______
a) pariah b) ingroup c) threat-group d) outgroup