?
Match the following columns:
Match the following columns:
| Column I | Column II |
| a. Outer covering | 1. Danielli Davson (1935) |
| b. Protoplasm | 2. Ca and Mg pectates |
| c. Middle lamella | 3. fluid content of cell |
| d. Sandwich or lamellar model | 4. Cell wall and Cell membrane |
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