Natural barriers and the immune system defend the body against organisms that can cause infection. Some of these natural barriers can include the skin, mucous membranes, tears, earwax, mucus, and etc.
Answer:
if your difficulty in sleeping is not due to health problems, here are some tips that can help you get back to sleep. Stop watching the clock. Marking off the minutes only heightens your distress about being awake. Try relaxing your body to fall asleep.
Explanation:
The answer for this problem is stage 3