What is the name used to refer to the clogged xylem tissue?
       
      
                
     
    
    
    
    
    1 answer:
            
              
              
                
                
Heartwood. In contrast to sapwood, a term for the dead, clogged xylem cells near the center of a tree. Heartwood is the tree's main column of support.
                                
             
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