Muscle are mostly derived from

Options

A. Ectoderm
B. Endoderm
C. Mesoderm
D. both Mesderm and endoderm.

Answer

**Step-by-Step Solution:**

1. **Understanding Germ Layers**: During embryogenesis, three primary germ layers are formed from the zygote: ectoderm, mesoderm, and endoderm. Each of these layers gives rise to different tissues and organs in the body.

2. **Identifying the Functions of Each Germ Layer**:
- **Ectoderm**: Primarily gives rise to the nervous system and skin.
- **Endoderm**: Forms the lining of the digestive and respiratory tracts, as well as internal organs such as the liver and pancreas.
- **Mesoderm**: This layer is responsible for forming muscles, bones, the circulatory system, and parts of the excretory system.

3. **Focusing on Muscle Development**: Since the question specifically asks about muscles, we need to identify which germ layer contributes to muscle formation.

4. **Conclusion**: Muscles are primarily derived from the mesoderm. Therefore, the correct answer to the question is **mesoderm**.

**Final Answer**: Muscles are mostly derived from the **mesoderm**.

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