Answer:
The skin
Digestive tract
Vagina
Mucous membrane
Explanation:
The skin prevents microbes from entering the body
Digestive tract e.g. stomach acid is a natural defence mechanism
The vagina is acidic and this prevents harmful bacteria from growing with it's own flora.
Mucous membranes e.g. lining of the mouth, nose, eyelids are all defense mechanisms.
Answer:
Cause you have to learn in School, not sleep
Overuse? The question isn't phrased very well, but alcohol damages a lot of your bodies natural processes and can permanently damage your liver and brain.
The answer would definitely be c
<h3>I believe this is
true, but please give feedback if it turns out I'm incorrect.</h3>