Oxygen<span>, </span>sulfur<span>, </span>nitrogen<span>, and </span>hydrogen<span>.
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Answer:b
Explanation:I believe it’s b I looked it up on google 
 
        
             
        
        
        
Answer:
the study of heredity and the variation of inherited characteristics.
 
        
                    
             
        
        
        
Answer:
50% will have ears
Explanation:
To have ears you must have the trait nn since the ears trait is recessive,  2 of the four possible offspring are like this, so 50%
 
        
                    
             
        
        
        
Answer:
c
Explanation:
The salinity of the water is increased.