Answer:
B. Theory
Explanation:
A theory can be changed as new information is discovered.
 
        
             
        
        
        
I think it is rna, or ribosomes
        
             
        
        
        
Answer: Air pollution is responsible for seven million deaths each year in the US
Explanation:  https://www.who.int/health-topics/air-pollution#:~:text=The%20combined%20effects%20of%20ambient,cancer%20and%20acute%20respiratory%20infections.