6. How does a vaccine work?
those who tell me the first answer i will mark as brainlist
and vote +thanks and i will follow just now

Vaccines help develop immunity by imitating an infection.

It causes the immune system to produce T- lymphocytes and antibodies.

once the imitation infection goes away, the body is left with a supply of T- lymphocytes, as well as B- lymphocytes that will fight the disease in future.

the sun's light combined with the visible wavelenghts form what is called ultraviolet radiation, which are the long waves at the end of a visible light sprectrum.

hope it ,

bioteacher101