The second line of defense of the immune system, also an aspect of innate immunity, is the nonspecific resistance. These defense mechanisms destroy invaders in a general way and do not target specific antigens.
I think that it's with a viral infection.
Once a year or possibly for a physical when you are doing a sport or camp. Hope this helps!
Answer:
strength
Explanation:
athletes need speed but in order to be fast you also need to have strength to help your body
