Regents Prep: Living Environment
Multiple-Choice Questions
  Question 2 of 5   Population Diversity
An ecosystem is represented below. This ecosystem will be self-sustaining if


 1.  the organisms labeled A outnumber the organisms labeled B

 2.  the organisms labeled A are equal in number to the organisms labeled B

 3.  the type of organisms represented by B are eliminated

 4.  materials cycle between the organisms labeled A and the organisms labeled B

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