In development of Frog gastrulation involves

Options

A. Epibody
B. Emboly
C. Invagination and ingression
D. All the above.

Answer

### Step-by-Step Text Solution:

1. **Understanding Gastrulation**: Gastrulation is a crucial phase in embryonic development where the single-layered blastula reorganizes into a multi-layered structure known as the gastrula. This process involves significant morphogenetic movements.

2. **Identifying Morphogenetic Movements**: During gastrulation, several specific movements occur:
- **Epiboly**: This is the movement of cells that spread to cover a larger area, typically moving over the blastoderm to cover the underlying cells.
- **Involution**: This refers to the inward movement of cells, which helps in forming new layers of cells. This is essential for creating the three germ layers: ectoderm, mesoderm, and endoderm.
- **Invagination**: In this process, a portion of the blastoderm folds inward, creating a new cavity called the archenteron, which eventually develops into the gut.

3. **Conclusion**: All these movements (epiboly, involution, and invagination) are integral to the process of gastrulation in frogs. Therefore, the correct answer to the question is that gastrulation involves all of the above-mentioned processes.

### Final Answer:
Gastrulation in the development of frogs involves epiboly, involution, and invagination. Thus, the correct answer is "all of the above."

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