The answers A , A matter of minutes :))
 
        
                    
             
        
        
        
So to sum up, when matter is transitioning from solid to liquid (melting) or liquid to solid (freezing<span>), its </span>temperature<span> is fixed at the </span>melting/freezing<span> point, which is the </span><span>same temperature</span>
        
             
        
        
        
Valves ensure blood flows toward your heart. Vein valves work to bring the blood that flowed down via arteries back up to your heart.
        
             
        
        
        
Answer:
?WHAT
Explanation:
class is this for ? 
and pls this doesnt make sense 
 
        
             
        
        
        
<span>The aurora borealis (northern lights) form when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. These collisions result in countless little bursts of light, called photons, which make up the aurora.</span>