Gastrulation is considered a dynamic event in embryonic development. Why?

Explanation

**Step-by-Step Solution:**

1. **Definition of Gastrulation**: Gastrulation is a crucial phase in embryonic development that follows the formation of the blastula. It involves the transformation of the blastula into a structure known as the gastrula, which is characterized by the formation of three distinct germ layers.

2. **Formation of Germ Layers**: During gastrulation, three primary germ layers are formed:
- **Ectoderm**: This layer will eventually develop into the skin, nervous system, and other structures.
- **Mesoderm**: This layer gives rise to muscles, bones, and the circulatory system.
- **Endoderm**: This layer forms the lining of the digestive tract and other internal organs.
...