It enters through the stoma.
 
        
             
        
        
        
Explanation:
As shown in the illustration the highest percentage of air is composed of nitrogen gas at 78%. The second highest percentage is oxygen at 21%. The other trace gases, including carbon dioxide, make up about 1% of the gas composition. 
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Answer:
Erythrocytes is the answer 
 
        
                    
             
        
        
        
Answer: The answer is D. 0%.
Explanation: All of the offspring will have a mix (Bb) for the trait.