The villi develops an organ that connects the embryo to the uterine wall which is known as ___________-

Explanation

**Step-by-Step Solution:**

1. **Understanding the Role of Villi**: Villi are small, finger-like projections that develop from the embryo during early pregnancy. They play a crucial role in connecting the embryo to the uterine wall.

2. **Identifying the Organ Formed**: The villi contribute to the formation of an organ that serves as a connection between the mother and the developing embryo. This organ is essential for nutrient and gas exchange.

3. **Naming the Organ**: The organ formed by the villi that connects the embryo to the uterine wall is known as the **placenta**.

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