Answer: option C) cowpox and smallpox are caused by the same virus
Explanation:
Cowpox is a skin disease that affects cattle. It is caused by an Orthopoxvirus, with lesions occurring principally on the udder and teats of the animals. 
Human infection may occur from touching infected cows, and thus giving immunity to smallpox (an acute infection caused by the same poxyvirus, in HUMANS) 
So, Jenner's successful use was because cowpox and smallpox are caused by the same virus
 
        
             
        
        
        
Answer:
that is the egg and is trying to hatch
Explanation:
 
        
                    
             
        
        
        
Answer:
mRNA is transcribed from DNA.
The nucleotides in mRNA code for amino acids.
tRNA translates the mRNA sequence into an amino acid sequence so proteins can be made.
Explanation: FOR REAL THE FACTS