Please help will mark. Why do we need vaccine booster shots to increase the amount of pathogens in the body?
to increase the amount of vectors in the body?
to increase the amount of antibodies in the body?
to increase the amount of red blood cells in the body?

Ascientist introduced mutations in a gene sequence isolated from bacteria. study the sequence, and identify the steps where the mutations may affect the formation of proteins. in the sequence, black letters stand for protein coding regions and red letters stand for noncoding regions.