I believe that the most logical  explanation for this is that the right primary bronchus is wider than the left one (and the right lung is larger than the left lung), therefore the right lung receives slightly more carcinogenic cigarette smoke with each puff. In lung cancer. the cancer cells usually arise from the epithelium lining of large bronchus. 
        
             
        
        
        
Answer:
air
Explanation:
The water molecules are being added to the oxygen and hydrogen in the air, which makes it heavier
 
        
             
        
        
        
A biogeochemical cycle<span> or substance turnover or cycling of substances is a pathway by which a chemical substance moves through biotic (biosphere) and abiotic (lithosphere, atmosphere, and hydrosphere) compartments of Earth.
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i hope this helps
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Zane</span>
        
             
        
        
        
I would say the answer is A. moistens and filters incoming air.
        
                    
             
        
        
        
Phospholipids have a hydrophilic(water-liking) ‘head’ and a hydrophobic ‘tail’ so they are amphipathic. They form a lipid bilayer because of their amphipathic properties. The tails get sandwiches between the hydrophilic heads that are able to interact with water. 
Hope this helps:)