Answer:
a skin
Explanation:
Mechanical barriers physically block pathogens from entering the body. The skin is the most important mechanical barrier. In fact, it is the single most important defense that the body has against pathogens
I think it is nose hairs because it keeps harmful things from entering through your nose.
Answer is B.
*Please correct me if I am wrong.
nelly will be more scared becacause she has just woke up
The answer would be to always wash your hands!
Artificial selection
Just took tha test
