MCQOPTIONS
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| 1. |
The yolk plug is a structure in gastrula which is formed by the protrusion of |
| A. | Endodermal cells |
| B. | Endo-mesodermal cells |
| C. | Ectodermal cells |
| D. | Mesodermal cells |
| Answer» B. Endo-mesodermal cells | |