Question

The body has natural defense mechanisms against disease. Which of the following is not a natural defense mechanism? white blood cells skin mucous membranes antibodies vitamins

Answer 1

White blood cells help against invading bodies, as they pretty much absorb them /^ easiest way to explain it, so not them.
I think it's vitamins as you take them as supplements if you're lacking them, say if you had scurvy or something.
Sorry if this isn't what you're looking for.