What important changes happens during the S phase ?

Explanation

### Step-by-Step Solution:

1. **Understanding the Cell Cycle**:
- The cell cycle consists of two main phases: Interphase (I phase) and M phase (mitotic phase).
- Interphase is further divided into three sub-phases: Gap 1 (G1), S phase (Synthesis), and Gap 2 (G2).

2. **Identifying the S Phase**:
- The S phase is specifically known as the synthetic phase of the cell cycle.
...