After fertilization antipodals and synergids:

Options

A. Persist
B. Degenerate
C. Change into reproductive structures
D. Provide nutrition

Explanation

### Step-by-Step Solution

1. **Understanding the Terms**:
- Antipodals and synergids are specific types of cells found in the embryo sac of flowering plants.
- Antipodals are located at the opposite end of the embryo sac from the egg cell, while synergids are located near the egg cell.

2. **Role of Synergids and Antipodals**:
- Synergids play a crucial role in guiding the pollen tube towards the egg cell during fertilization.
- Antipodals are thought to have a supportive role but do not directly participate in fertilization.

3. **Fertilization Process**:
- Fertilization occurs when the male gamete (sperm) fuses with the female gamete (egg cell), resulting in the formation of a zygote.
- This process marks the beginning of the development of the embryo.

4. **Post-Fertilization Changes**:
- After fertilization, the zygote begins to develop into an embryo.
- The synergids and antipodals, which were present in the embryo sac during fertilization, no longer serve a purpose.

5. **Degeneration of Cells**:
- Following fertilization, both synergids and antipodals degenerate. This is because their primary function was to facilitate the fertilization process.
- Once fertilization is complete and the zygote is formed, these cells are no longer needed.

6. **Conclusion**:
- Therefore, the correct answer to the question is that after fertilization, both antipodals and synergids degenerate.

### Final Answer:
**The correct option is: Degenerate.**