In the United States alone, more than 7 ________ introduced species (not counting microorganisms) have been documented, of which about 15% cause ecological and economic damage
A) hundred
B) thousand
C) million
D) billion
E) trillion
B
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The term demographic transition refers to
a. a requirement for a population to reach a specific size before it becomes stable b. the slowing down in the growth of a population as it approaches the carrying capacity c. the decline in death rates followed by decline in birth rates when a country becomes industrialized d. the decline in death rates followed by a decline in birth rates that occurred when the germ theory of disease was discovered e. a stabilization of crude birth rates
Which of the following locations would most likely contain a high percentage of sand?
A) Location 2, along a steep mountain front
B) Location 3, in sand dunes
C) Location 4, along a beach
D) Locations 2 and 3
E) Locations 3 and 4
The eighteenth and nineteenth century slave trade represents ________ African migration while the twentieth century relaxation of U.S. immigration quotas resulted in ________ Latin American and Asia migration
A) chain; hierarchical B) forced; voluntary C) voluntary; forced D) chain; voluntary E) forced; forced
In Mediterranean climates such as in parts of California, Australia, and South Africa, frequent wildfire is necessary for the health of natural plant communities.
Answer the following statement true (T) or false (F)