A Small Wooded Area,once Surrounded by Pastures and Shrubby Areas,gradually

question 69

Multiple Choice

A small wooded area,once surrounded by pastures and shrubby areas,gradually became enclosed by housing developments.Ecologists studying the area noticed that,as housing developments encroached,some species disappeared from the woodland,but no new species entered.What is the most likely reason for this?

• A) The housing developments were damaging the woodland by causing erosion.
• B) The housing developments were damaging the woodland by causing air and water pollution.
• C) The housing developments acted as a barrier to dispersal into and out of the woodland.
• D) Extinction rates increased in the small area,while dispersal rates were unchanged.
• E) Colonization rates increased in the small area,while extinction rates remained stable.

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