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Question
Q: what is natural defense system of the human body?
Option | Answer | Is Correct |
---|---|---|
1 | Bacteria, viruses and fungi are the main disease producing microorganisms. The first line of defence against them is the skin. Li does not allow the bacteria to enter the body. The second line of defence is the lymphatic systems. The lymph glands act as filters to check the spreading of infection. The third line of defence is the protein molecules called antibodies. |
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