Answer:
True
Explanation:
There are several types of cytokines used in cell signaling; interferons, interleukins, tumor necrotic factor, and chemokines. T helper cells mainly produce interleukins. When activated by Antigen-Presenting-cells, t-helper cells produce interleukins that activate B cells and is significant in their proliferation during an infection.
B: The evaporated due to violent impacts.
<span>Vaccination offers protection against future exposure to pathogens because the vaccine is made from the part of the weakened pathogen. A vaccine gives enough immunity in a person’s system and helps create antibodies against sickness brought by pathogens. This will result in you to acquire future protection or immunity against the pathogen without getting sick. </span>
