Answer:
The second line of defense.
Explanation:
The second line of defense, part of the immune system response, is Nonespecific Resistance.
I'm not sure of your question, but I think you're looking for <span>esophageal sphincter. </span>
The advantage of the mRNA vaccines is that they don't use your body's own immune system.
<h3>What is mRNA vaccine?</h3>
The mRNA vaccine makes use of the messenger RNA to trigger the body into an immune response. This occurs by instructing the cells to make a protein that is similar to that of the attacking agent.
Thus, the advantage of the mRNA vaccines is that they don't use your body's own immune system.
Learn more about mRNA vaccine:brainly.com/question/23134032
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The answer to your question is,
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-Mabel <3
