A stable population would remain at equilibrium if ________
A) births and immigration increased by the same number of organisms
B) emigration rates and death rates increased equally
C) births and deaths increased by the same number of organisms
D) the birth rate increased as the death rate decreased
C
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Biological nitrogen fixation (nitrogen fixation that is performed by living organisms) is carried out by ________
A) pine trees B) slime molds C) mammals D) fungi E) various species of specialized bacteria
Which of the above molecules is a carboxylic acid?
A. a B. b C. c D. d E. none of the above
Which of the following best describe conditions in the mesosphere?
A) The mesosphere corresponds with the ozonosphere. B) The mesosphere is located between the troposphere and the stratosphere. C) Temperatures rapidly increase with altitude in the mesosphere. D) High altitude noctilucent clouds form in the mesosphere. E) The mesosphere is completely within the heterosphere.
Which environmental NGO regularly informs subscribers through its website about environmental threats all over the world?
A. Greenpeace B. The Audubon Society C. Friends of the Earth D. The Environmental Defense Fund E. Natural Resources Defense Council