Answer:
I think the answer is C I hope you get this right, tell me if I am wrong plz
Explanation:
Genetic Change in Viruses. Viruses are continuously changing as a result of genetic selection. They undergo subtle genetic changes through mutation and major genetic changes through recombination. Mutation occurs when an error is incorporated in the viral genome
It is due to agitation of the heart. This is the result of a blow in the area directly over the heart.
