Which of the following human development stage becomes embedded in the uterine endometrium by a process called implantation and lead to pregnancy ?

Options

A.
B.
C.
D.

Answer

To answer the question regarding which human development stage becomes embedded in the uterine endometrium by a process called implantation and leads to pregnancy, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Stages of Human Development**:
- The stages of human development include the zygote, morula, blastocyst, and the embryo. Each stage represents a different phase in the development of a fertilized egg.

2. **Identifying the Stages**:
- **Zygote**: This is the initial stage formed immediately after the sperm fertilizes the egg.
- **Morula**: This stage occurs after several divisions of the zygote, resulting in a solid ball of cells.
- **Blastocyst**: This is the stage that follows the morula. The morula develops into a blastocyst, which has a hollow structure with an inner cell mass that will eventually develop into the embryo.

3. **Understanding Implantation**:
- Implantation is the process by which the blastocyst attaches itself to the uterine endometrium (the inner lining of the uterus). This is a crucial step for establishing a pregnancy.

4. **Conclusion**:
- Among the stages mentioned, the **blastocyst** is the one that becomes embedded in the uterine endometrium through the process of implantation. This stage is essential for the continuation of pregnancy.

5. **Final Answer**:
- The correct answer is **blastocyst**.