Triploblastic animal differ from diploblastic animal by having

Options

A. ectoderm
B. mesoderm
C. endoderm
D. all of these

Answer

To answer the question about how triploblastic animals differ from diploblastic animals, we can break down the solution into clear steps:

### Step-by-Step Solution:

1. **Define Diploblastic Animals**:
- Diploblastic animals are those that have two primary germ layers: the ectoderm and the endoderm. These layers give rise to the outer and inner tissues of the animal.

2. **Define Triploblastic Animals**:
- Triploblastic animals, on the other hand, possess three primary germ layers: the ectoderm, the mesoderm, and the endoderm. The mesoderm is the middle layer that develops between the ectoderm and endoderm.

3. **Identify the Key Difference**:
- The key difference between triploblastic and diploblastic animals lies in the presence of the mesoderm. Triploblastic animals have a mesoderm, while diploblastic animals do not.

4. **Conclusion**:
- Therefore, triploblastic animals differ from diploblastic animals by having the mesoderm.

### Final Answer:
Triploblastic animals differ from diploblastic animals by having the mesoderm.

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