Mass separation of cells in embryo is

Options

A. Emboly
B. Involution
C. Delamination
D. Epiboly.

Answer

To answer the question "Mass separation of cells in embryo is", we need to analyze the provided options one by one and identify the correct term that describes this process.

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the term that describes the mass separation of cells in an embryo.

2. **Evaluate Option 1: Emboli**:
- Emboli refers to the process of invagination of the blastula, which does not involve mass separation of cells.
- **Conclusion**: This option is incorrect.

3. **Evaluate Option 2: Involution**:
- Involution is the inward movement of a tissue sheet to form an underlying layer. While it involves movement, it does not specifically refer to mass separation of cells.
- **Conclusion**: This option is also incorrect.

4. **Evaluate Option 3: Delamination**:
- Delamination is the process where one sheet of cells splits or migrates into two parallel sheets. This process involves the separation of cells, which fits the definition of mass separation.
- **Conclusion**: This option is correct.

5. **Evaluate Option 4: Epiboly**:
- Epiboly involves the rapid growth of cells on one side that surround slower-growing cells, leading to the formation of layers but not mass separation of cells.
- **Conclusion**: This option is incorrect.

6. **Final Answer**: Based on the evaluations, the correct answer is **Delamination**.