I know its 21 or 18 or 22
Explanation:
Before getting sick people often do not expect that they will catch some disease or infection. After they do, they have to take one or several doses of a vaccine and it is depending on the disease that they are having.
They will recover after the vaccine but they will also develop natural immunity in them which means that in that case, they will catcht the same or similar disease so easily again.
I believe it’s B) the others are not linked together in base pairs
Cold can be caused by cold weather out side and the flu u can get from other people that are sick or bad living enviroments or rotton food
Well i think its C hope this helped
Explanation:
