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What is First Line of defence in immune system? Physical, Chemical & Biological barriers involved. - YouTube
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Eddy | SPM iTutor 🤖 🇲🇾 on Twitter: "The body's 1st line of defence against infection consists of physical and chemical barriers ⚔️🛡️ Quick head to toe breakdown ⤵️ #KSSM #SPM #Biology #
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