Which of the following antidepressant medications has the HIGHEST safety margin?
A) Doxepin
B) Imipramine
C) Paroxetine
D) Nortriptyline
Answer: C) Paroxetine
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U.S. passenger pigeon populations are
a. healthy. b. threatened. c. endangered. d. extinct.
How does phosphorus enter the biological portion of the cycle?
a. Land plants take up dissolved phosphate from the soil water. b. Bacteria fix phosphate from the atmosphere. c. Consumers eat phosphate containing soil. d. Bacteria fix phosphate from water. e. Erosion of rocks moves phosphate into water, which consumers drink.
Populations that experience significant contest competition:a
show small changes in population size over time. b. show great changes in population size over time. c. are particularly susceptible to extinction. d. show little intraspecific competition. e. are characteristic of environments with abundant resources.
Why did industrial melanism in the peppered moth, Biston betularia, help convince researchers that the intensity of natural selection can be very strong?
A. The dark-colored allele increased in frequency very rapidly in multiple populations and later decreased rapidly after the environment changed. B. The dark-colored morph drove the light-colored morph to extinction. C. Birds were unable to prey on the moths once they acquired their color adaptations. D. The moth population exploded, covering England with moths during the Industrial Revolution. E. Natural selection maintained constant proportions of the color alleles in the population, despite rapid environmental change brought about by the Industrial Revolution.