Which is the First and second line of Defence in the immune system?

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Solution

First line of defense means innate immunity and second line is acquired immunity

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$\begin{matrix} Column I & Column II A. Active natural immunity & 1. Injection of gamma globulins B. First line of defence & 2. Inflammation and phagocytosis C. Passive natural immunity & 3. Direct contact with the pathogens that have entered inside D. Second line of defence & 4. Surface barriers 5. Antibodies transferred through the placenta \end{matrix}$

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