Filoviruses (such as Ebola virus) that cause severe hemorrhagic fevers generally have high ________ but low ________
A) incidence / prevalence
B) prevalence / mortality
C) mortality / morbidity
D) morbidity / mortality
Answer: C
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The Pill
a. reduces menstrual cramps. b. can cause serious cardiovascular disorders especially in smokers. c. increases the risk of breast, cervical, and liver cancers. d. is the most common fertility control method in the United States. e. includes all of these.
Which of the following hunting methods has the lowest frequency of success but requires the least amount of energy?
A) satiation B) ambush C) stalking D) pursuit
When a species of bird preys upon the seeds of a plant and favors the smallest seeds,
A) the prey species functions as an agent of natural selection on the predator. B) natural selection favors individual plants that produce the largest seeds. C) the plants compensate for their losses by producing proportionately more smaller seeds. D) the bird species is unaffected when directional selection favors plants that produce the largest seeds.
Polyphagous parasites feed on
A. any plant species. B. many different host species. C. ectoparasites. D. parasitoids. E. a single host species.