The body uses specific methods to address pathogens that are causing illness. if a person has memory b cells against a certain pathogen, what will happen if that pathogen infects the person's body again?
a. they are likely to develop that disease.
b. they are much less likely to develop the disease a second time.
c. they are able to spread the disease to others through physical contact.
d. they are probably still sick with the disease.

They are much less likely to develop the disease a second time.

Memory B cells help your body prevent getting sick a second time once you get sick the first time. So for instance it may take about 15-16 days for your memory B cells to produce enough antibodies against this certain pathogen the first time, however once you get sick with the same thing the second time, these memory B cells will kick in and will take less time to fight off the pathogens in like 5 days. :)

Lymphatics and immune system is very important to study :) hah

Good luck and I hope this has helped you! :D

Smoking damages the respiratory system by inhalation of a foreign substance, that is absorbed and residue is left behind on our lungs sponge like substance. the gas that is inhaled also increase your blood pressure and dilates your blood vessels. also the process of inhaling and exhaling the smoke it causes irritation to the throat and mouth. smoking can cause lung cancer and other respiratory and circulatory diseases.