Answer:
Memory cells are specalised types Nerve Cells .
<span>vaccine
The wording given is pretty much the exact definition of a vaccine. The key to how a vaccine works is that it provides to the immune system, samples of the surface proteins of the infectious materials. With those samples available, the immune system is able to produce antibodies that react to those proteins.</span>
Answer:
a exothermic;endothermic
Explanation:
learned that in sience class yesterday
