It allows memory b cells to remember the virus and that makes the virus completely immune. So, if there were a real situation in which the individual got the real form of the virus, then the immune system would act quickly in neutralizing the situation; hence, why vaccines are very important.
Answer:
Trans-Saharan trade requires travel across the Sahara between sub-Saharan Africa and North Africa. While existing from prehistoric times, the peak of trade extended from the 8th century until the early 17th century. The Sahara once had a very different environment
Answer:
I imagine it was using and threatening brute force and jail time.
Explanation:
because this is shown in a handful of stories about racial tension.
hope it helps ;)
