What are morphogenetic movements?

Explanation

**Step-by-Step Solution:**

1. **Definition of Morphogenetic Movements:**
Morphogenetic movements refer to the organized movements of cells during the development of an embryo that lead to the formation of different tissues and organs. These movements are crucial during the gastrulation phase of embryonic development.

2. **Timing of Morphogenetic Movements:**
These movements occur during gastrulation, a significant phase in embryonic development when the blastodermic vesicles begin to move and rearrange themselves within the embryo.

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