the skin protection system composed of dead cells contain keratin protein indigestible
produced by the skin to help reduce the pH inhibit the growth of the disease Lysozymes
. Salvia sweat and tears the enzyme anti-bacterial
.Many of the bacteria in the stomach will be destroyed by the acid (HCl)
sticky substance, nose, respiratory disease,
Cillia trap Keep moving mucus neck surface protection on gas exchange
target immune system and materials at the international
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