DNA and RNA each contain four nitrogenous bases. They have 5 not 4.
        
             
        
        
        
Answer:
Isotonic
Explanation:
A solution is isotonic to a cell if it has the same Concentration of dissolved particles as the cell. Water molecules move in and out of the cell at equal rate, so the cell size remains the same.
 
        
             
        
        
        
Phenotype? I think that's it
        
             
        
        
        
The answer is 60% are active
        
                    
             
        
        
        
There are few donor lungs available.<span>In 2010, about 1,800 lung transplants were performed in the United States.
Brainliest please?</span>