Question

how does skin prevent entry of germs

Answer 1

The immune system and blood cells. If germs get through the skin or mucous membranes, the job of protecting the body shifts to your immune system. Your immune system is a complex network of cells, signals, and organs that work together to help kill germs that cause infections.
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Answer 2

skin tries to avoid entry of germs.

to do it so , it releases salt from the body which kills the germs.