The answer is written on the pic I sent you with this 
 
        
             
        
        
        
Answer:
They can worsen symptoms for people with breathing difficulties.
Explanation:
Ultrafine particles are small particles found in dirty air. They aren’t filtered due to their very small size. They enter the lungs and cause certain conditions such as oxidative stress, inflammatory mediator release, and could induce heart disease, lung disease and other systemic effects.
People who have breathing difficulties have their case worsened due to these particles. 
 
        
                    
             
        
        
        
the radiations that are used to treat cancers are of the gamma type. primarily emitted from cobalt-60 (a radioactive isotope).  and it is more controlled than other radiation exposures. i.e. solar radiation which is not controlled. 
hope that this helps.
 
        
             
        
        
        
Answer:
The answer is A. Draw branches for the domains: Bacteria, Archaea and Eukarya
Explanation:
Three Domains of Life:
Bacteria, Archaea and eukarya are the three principal branches or domains of the tree of life that explains the evolutionary relationship between all living organisms. 
The first two domains, bacteria and archaea comprise the prokaryotic unicellular organisms. The third domain, eukarya includes all eukaryotic organisms.
All other organisms have evolved from these three principal domains.
 
        
             
        
        
        
Pangea began to separate.