What is the main way the skin prevents pathogens from entering the body?

a)
by fighting them

b)
by acting as a barrier

c)
by creating immunity against them

d)
by triggering a response in the brain

The MAIN way the skin prevents pathogens from entering the body is B. by acting as a barrier.
Our skin is a barrier between blood and tissues inside and everything found outside of our body. The skin protects us from various kinds of pathogens by shielding us from them.

Need a picture to do this

Ithink option a is correct because you cannot donate a different blood group than yours because it won't match.option a says betsy can donate to mark. they have the same blood group so donation can happen.