Chosse the correct one

Options

A. Mesoderm-skeleton
B. Mesoderm-brain
C. Ectoderm-liver
D. Endoderm-epidermis.

Answer

**Step-by-Step Solution:**

1. **Understanding the Germ Layers**: The human embryo has three primary germ layers: ectoderm, mesoderm, and endoderm. Each layer gives rise to different tissues and organs in the body.

2. **Identifying the Functions of Each Layer**:
- **Ectoderm**: This layer develops into structures such as the brain, spinal cord, nerves, ears, nails, and hair.
- **Mesoderm**: This layer is responsible for forming muscles, the heart, kidneys, gonads, blood cells, cartilage, and the skeleton.
- **Endoderm**: This layer gives rise to internal organs such as the intestines, liver, lungs, and pancreas.

3. **Analyzing the Options**:
- **Option A: Mesoderm skeleton** - The skeleton is indeed formed from the mesoderm, making this option correct.
- **Option B: Mesoderm brain** - The brain is formed from the ectoderm, so this option is incorrect.
- **Option C: Ectoderm liver** - The liver is derived from the endoderm, making this option incorrect.
- **Option D: Endoderm epidermis** - The epidermis (outer skin layer) is formed from the ectoderm, so this option is also incorrect.

4. **Conclusion**: After analyzing all the options, the correct answer is **Option A: Mesoderm skeleton**.