bro....1 answer is enough 
 
        
             
        
        
        
Answer: Why?
Explanation: I hope you are okay.
 
        
                    
             
        
        
        
two strands of DNA are held together by weak hydrogen bonds.
 
        
                    
             
        
        
        
This might help: 
https://quizlet.com/1965478/environmental-health-test-1-flash-cards/ 
        
             
        
        
        
1 poverty
2 hunger
3 drugs
4 racism
5 mental problems
( im not that sure )