Q:
      
      
         
            
Biogeochemical cycles are crucial to ecosystem function because
         
       
      
      
      
          
      
      
          Answer & Explanation
         Answer: D) nutrients and other life-sustaining molecules are in limited supply and must be continually recycled         
         
Explanation: Biogeochemical cycles are crucial to ecosystem function because ::
 
1. Chemical elements are available in only limited amounts and must be recycled.
2. Nutrients and other life-sustaining molecules are in limited supply and must be continually recycled.
       
      
      
      
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