Answer:
b
Explanation:
Further testing proved conclusively that the cowpox virus was able to build immunity against smallpox. Using his theory, similar vaccines were later created for diseases such as yellow fever, mumps, rubella and tetanus.
 
        
                    
             
        
        
        
Answer:
ok so, there are 3,000 characters in a page and you want someone to write a 30 page essay, that's 90,000 characters, it would take up too much space on brainly and would take too long, I'm very sorry if nobody can do it. :/
Explanation:
 
        
                    
             
        
        
        
Answer:
Carlos has prepared the above oral presentation to give to his Music Appreciation class. During the speech, it will be particularly important for him to engage his audience by 
d. varying the volume of his voice 
Explanation:
this will allow the listeners to understand his different emotions during the oral presentation 
 
        
             
        
        
        
Answer:
I cant really see it but i think your answer should be C
Explanation: