Answer:
The crust is not the thickest layer of earth
:)
Protons electrons and newtrons
<span>The protons and neutrons are located in the nucleus of the atom</span>
The answer is Vaccination.
Acquired or adaptive immunity is the body's third line of defense. This is protection against specific types of pathogens. Acquired immunity may be either natural or artificial in nature. Both natural and artificial immunity have passive and active components. Active immunity results from an infection or an immunization, while passive immunity comes from naturally or artificially gaining antibodies.
Blocking the way upstream