When a donkey mates with a horse, a mule is produced. However, mules are sterile. This is an example of
A) allopatric speciation.
B) sympatric speciation.
C) speciation by hybridization.
D) a postzygotic reproductive barrier.
D
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The U.S. national park system includes ____ major national parks.
A. 12 B. 28 C. 58 D. 100 E. 110
A citizen-based global sustainability movement that is emerging is comprised of
a. a loosely connected worldwide network of grassroots NGOs b. regulatory agencies within governments that oversee environmental laws c. special interest groups that lobby for restriction of environmental laws d. environmentalists that have won elections e. a well-funded movement to change the way public lands are used in the U.S.
Dolphins, penguins, ichthyosaurs have undergone ____ that gave them similar shapes through adaptations that permitted rapid swimming
A) ?convergent evolution B) ?speciation C) ?divergent evolution D) ?natural selection
Which of the following is not included in the calculation of the GNP of a coal mine?
A) The cost of fuel to run the mining equipment B) The cost of health benefits for the workers C) The gradual breakdown and need for replacement of the equipment D) The depletion of coal from the mine