Skin - Protects against microbes, 2 Physical barriers - Skin and tiny hairs in our breathing system, 2 Chemical barriers - Acid in stomach and antispectic in tears, Cilia - Tiny hairs in breathing system, Mucus - Traps microbes and dirt,

Leaderboard

Estilo ng visual

Mga pagpipilian

Magpalit ng template

Ibalik ng awtomatikong pag-save: ?