Why is the skin considered as the first line of defense of our body against microorganisms

Skin, tears and mucus are part of the first line of defence in fighting infection. They help to protect us against invading pathogens. You have beneficial bacteria growing on your skin, in your bowel and other places in the body (such as the mouth and the gut) that stop other harmful bacteria from taking over..

Explanation:

when a microorganism comes towards us, its the first thing they come in contact with- our skin.

i believe it would be c: tons.