Answer:
A. The molecule to which a drug binds
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When DNA ligase has compelted its job catalyzing the formation of a phosphodiester bond to bring together the backbone of two separate DNA strands and bind them together, the result is that two separate strands of DNA become one.
 
        
             
        
        
        
60 years is three half life for the substance, so 40*1/2^3=5
        
                    
             
        
        
        
Answer 
a good environment could mean better people better love and kindness bad environment could mean problems in your future and/or daily life this can affect everybody and anybody
Explanation:
 
        
             
        
        
        
Your correct answer to this question is C