Question
Enlist any four barriers that contribute to innate immunity.
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| S.No. | Type of Microbe | Name | Commercial Product |
| 1. | Fungus | a | Penicillin. |
| 2. | Bacterium | Acetobacter aceti. | b |
| 3. | c | Aspergillus niger. | Citric acid. |
| 4. | Yeast | d | Ethanol. |