?
Match List-I with List-II and select the correct answer:
Match List-I with List-II and select the correct answer:
| List-I | List-II |
| a. Apical cell theory | 1. Popham and Chan (1950) |
| b. Histogen theory | 2. Schmidt (1924) |
| c. Tunica-corpus theory | 3. Nageli (1858) |
| d. Mantle-core hypothesis | 4. Hanstein (1868) |
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