A generalist is a species that
A. Occupies a large habitat range
B. Occupies a wide range of ecological niches
C. Can reproduce only under specific conditions
D. Can reproduce under highly variable conditions
E. None of these are characteristics of a generalist species
Answer: B
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The Earth's magnetic field is generated by:
a) salty water moving through the deep parts of the crust b) convection currents in the atmosphere c) movement of iron and electrical currents within Earth's outer core d) aligned magnetic minerals within Earth's inner core
If the flow of air into a surface low pressure area is greater than the divergence of air aloft, the
surface pressure in the center of the low will:a. increase. b. decrease. c. remain the same. d. deepen.
Food safety issues of transgenic crops include
A) a decreased production of allergens in crops. B) the promotion of antibiotic resistance in pathogens and new allergenic properties in crops. C) interference with the effectiveness of immunizations. D) the development of herbicide resistance in humans.
Country A has a crude birth rate of 60 and a crude death rate of 15, while Country B has a CBR of 27 and a CDR of 9. Which country has a higher natural increase rate?
A) Country A B) Country B C) The NIR is the same in both countries. D) The rate depends on total population, so it can't be computed from this information. E) The CDR has no direct correlation to the CBR, so it cannot help determine the NIR.