In vertebrates, coelom is derived from which germ layer?

Options

A. Ectoderm
B. Endoderm
C. Mesoderm
D. Both ectoderm and endoderm

Answer

### Step-by-Step Solution:

1. **Understanding Coelom**: Coelom refers to the body cavity that is present in many animals, including vertebrates. It is an important feature that allows for the development of complex organs and systems.

2. **Identifying Germ Layers**: In vertebrates, there are three primary germ layers formed during embryonic development:
- **Ectoderm**: The outermost layer, which develops into structures such as the skin and nervous system.
- **Mesoderm**: The middle layer, which gives rise to muscles, bones, and the circulatory system, as well as the coelom.
- **Endoderm**: The innermost layer, which forms the internal organs like the digestive tract and respiratory system.

3. **Determining the Origin of Coelom**: The coelom in vertebrates is derived from the mesoderm. This layer is responsible for forming the body cavity that houses various organs and fluids.

4. **Conclusion**: Therefore, the coelom in vertebrates is derived from the **mesoderm** germ layer.

### Final Answer:
In vertebrates, coelom is derived from the **mesoderm** germ layer.

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