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Explanation:
The sun heats the air leading to warm air. the warm air rises thus makes the cooler air from the surroundings to replace it. This leads to creating wind . This same process applies for ocean currents.
The sun heats water which make warm water come to the surface of the ocean thus replacing it with cooler water leading to ocean currents. 
 
        
             
        
        
        
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>
 
        
                    
             
        
        
        
Horizontal or transverse or axial cut is if you cutting the object with the horizontal plane. The cut would look like ( -- ).
Vertical or longitudinal is cutting in the vertical plane. The cut would look like ( | )
<span>There is also coronal cuts which were a cut with direction from front to back. </span>
        
             
        
        
        
DNA replication occurs in the synthesis stage and is followed by the gap 2 stage