One type of density change is mass over volume.
        
                    
             
        
        
        
Answer: The SA node
Answer choices are:
<span>A.      </span>The AV node
<span>B.      </span>The SA node
<span>C.      </span>The purkinje fibers
<span>D.     </span>The AV bundle
The SA node<span> is the heart's natural pacemaker consisting of a cluster of cells located in the upper part of the wall of the right atrium. (the right upper chamber of the heart). The electrical impulses are produced and sent out from there to regulate heartbeat. This is also called the sinus code.  </span>
 
        
                    
             
        
        
        
I just took the QUIZ the answer to this question is  
The phenotype frequency does not change.
 
        
             
        
        
        
Hey there,
<span> (1 m)/(25 m/s) = 0.04 s
</span>
Your correct answer would be 40ms.
~Jurgen
        
             
        
        
        
Answer:
Folic acid
Explanation:
Antibacterial drugs helps fight the bacterial infections. these drugs helps release essential amino acids by impairing the production of folic acids in bacterial cells. Bacteria infection may get severe and hazardous if they are leave untreated.