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• 

  The nucleus of a cell is often described as the “director” of the cell. The nucleus has been given this name because it

  
  

  contains the cell’s genetic material.

  contains the cell’s cytoplasm.

  is the largest structure in the cell.

  sits directly in the center of the cell.

  
  
  

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• 

  Rabbits eat plants. Accordingly, rabbits belong to which of the following groups?

  
  

  Producers

  first-level consumers

  second-level consumers

  decomposers

  
  
  

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• 

  All of the organisms in an ecosystem are
  ultimately dependent upon which of the
  following groups for the energy they need to
  survive?

  
  

  producers

  first-level consumers

  second-level consumers

  decomposers

  
  
  

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