Which cavity arises by the invagination of endoderm and mesoderm

Options

A. Coelenteron
B. Archenteron
C. Pseudocoel
D. Coelom

Explanation

To answer the question "Which cavity arises by the invagination of endoderm and mesoderm?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Layers**:
- In embryonic development, there are three primary germ layers: ectoderm, mesoderm, and endoderm. Each layer gives rise to different structures in the body.

2. **Defining Invagination**:
- Invagination is a process during gastrulation where a part of the embryo folds inward, leading to the formation of a cavity.

3. **Identifying the Cavity**:
- The cavity formed by the invagination of the endoderm and mesoderm is known as the Archenteron. This is also referred to as the primary gut or digestive tube.

4. **Understanding the Function of Archenteron**:
- The Archenteron develops into the digestive tract of the organism. It is crucial for the formation of the gut and will eventually differentiate into various parts of the digestive system.

5. **Conclusion**:
- Therefore, the correct answer to the question is **Archenteron**.

### Final Answer:
The cavity that arises by the invagination of endoderm and mesoderm is the **Archenteron**.

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