Answer:
The intermediate density band is observed.
Explanation:
Messelson and Sthal's explained the model of  semi conservative nature of DNA replication. According to this model, the newly synthesized DNA molecule contains one newly synthesized strand and one parental strand.
Firstly, bacteria grown in 15N media is transferred to 14N media. The isolated DNA is centrifuged and intermediate density DNA  band is observed that contains one strand of 15N (parental strand) and one strand of 14N (newly synthesized strand). 
 
        
             
        
        
        
Answer:
b. 
Explanation:
iarw;ogha;owigh;owghaouwga
 
        
                    
             
        
        
        
The answer is the earth revolves around the sun. So it's A.
        
                    
             
        
        
        
The answer for your question is D
        
                    
             
        
        
        
The prey is likely to decrease/decline if the predator's population increases