Question
How is cheese prepared?
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Study the linking of DNA fragments shown above.
| S.No. | Type of Barrier | S.No. | Barrier |
| a. | Physical | i. | Skin, a |
| b. | Physiological | ii. | b, in the eye |
| c. | c | iii. | Interferon |
| d. | Cellular | iv. | WBC, d |