<span>Pulmonary vein
Pulmonary circulation is the movement of blood starting from the heart, where deoxygenated, or carbon dioxide-filled, blood leaves from the right ventricle and through the pulmonary valve, then into the left and right pulmonary arteries and arrives at the lungs. During the process of respiration, the carbon dioxide is released and oxygen is added to the blood. </span>
        
             
        
        
        
Answer:
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Explanation:bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
 
        
             
        
        
        
Is it because there is to many bliw dryes plugged in
        
             
        
        
        
I think they describe a structure of cyclopentane. Cyclopentane is a highly flammable alicyclic hydrocarbon with a chemical formula C₅H₁₀, consisting of a ring of five carbon atoms each bonded to hydrogen atoms above and below the plane. It occurs as a colorless liquid with a petrol-like odor.