B. Solar flares 
The auroras are caused by space dust particles reflecting and mixing with earth’s atmosphere
        
             
        
        
        
Answer:
B anti inflammitory medications 
Explanation:
Rheumatoid arthritis, or RA, is an autoimmune and inflammatory disease, which means that your immune system attacks healthy cells in your body by mistake, causing inflammation (painful swelling) in the affected parts of the body. RA mainly attacks the joints, usually many joints at once.
 
        
             
        
        
        
Answer:
taiga, temperate deciduous forest, savanna
 
        
                    
             
        
        
        
Oxygen molecules diffuse fast because the main gas in a cell in Carbon Dioxide its like if it was 99.9 percent carbon that .1 percent is oxygen and carbon dioxide being what it is. Automatically overrides the amount of oxygen. Basically it is nonpolar