A if the term vegetarian cannot be misleading

 
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The arrival in a new location of a non- original plant or animal species may be either intentional or 
unintentional. Rates of species movement driven by human transformations of natural environments as well 
as by human mobility-through commerce, tourism, and travel- dwarf natural rates by comparison. While 
geographic distributions of species naturally expand or contract over historical time intervals (tens to 
hundreds of years), species' ranges rarely expand thousands of miles or across physical barriers such as 
oceans or mountains. A number of factors confound quantitative evaluation of the relative importance of 
various entry pathways. Time lags often occur between establishment of non-indigenous species and their 
detection, and tracing the pathway for a long-established species is difficult. Experts estimate that non-
indigenous weeds are usually detected only after having been in the country for thirty years or having 
spread to at least ten thousand acres. In addition, federal port inspection, although a major source of 
information on non-indigenous species pathways, especially for agricultural pests, provides data only when 
such species enter via scrutinized routes. Finally, some comparisons between pathways defy quantitative 
analysis. For example, which is more "important": the entry pathway of one very harmful species or one by 
which many but less harmful species enter the country? 
16. Which of the following statements about species movement is
best supported by the information in the passage? 
A) Species movement is affected more by habitat modifications than by human mobility. 
B) Human-driven factors affect the rate at which species move more than they affect the long-term amount 
of such movements. 
C) Natural expansions in the geographic distribution of species account for less Species movement than do 
natural contractions. 
D) Natural environments created by commerce, tourism, and travel 
contribute significantly to species movement.
E) Movement of a species within a continent depends largely upon the 
geographic extent of human mobility within the continent. 

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