Some parts developed from ectoderm are

Options

A. Retina,epidermis and brain
B. Brain, liver and gills
C. Dermis,nerves and lungs
D. Spinal cord, epidermis and heart.

Answer

To answer the question about which parts develop from the ectoderm, we can analyze each option provided.

### Step-by-Step Solution:

1. **Understanding Ectoderm**: The ectoderm is one of the three primary germ layers in the early embryo. It primarily gives rise to structures such as the skin, nervous system, and certain sensory organs.

2. **Analyzing Option A**:
- **Ritina**: The retina is a part of the eye and is derived from the ectoderm.
- **Epidermis**: The epidermis is the outer layer of skin and is also derived from the ectoderm.
- **Brain**: The brain is part of the central nervous system and originates from the ectoderm.

Since all three components in this option (Ritina, epidermis, and brain) are derived from the ectoderm, this option is valid.

3. **Analyzing Option B**:
- **Brain**: Derived from ectoderm (valid).
- **Liver**: Derived from endoderm (not valid).
- **Gills**: Derived from endoderm (not valid).

Since liver and gills are not derived from ectoderm, this option is invalid.

4. **Analyzing Option C**:
- **Dermis**: The dermis is derived from mesoderm (not valid).
- **Nerves**: Derived from ectoderm (valid).
- **Lungs**: Derived from endoderm (not valid).

Since dermis and lungs are not derived from ectoderm, this option is invalid.

5. **Analyzing Option D**:
- **Spinal Cord**: Derived from ectoderm (valid).
- **Epidermis**: Derived from ectoderm (valid).
- **Heart**: Derived from mesoderm (not valid).

Since the heart is not derived from ectoderm, this option is invalid.

6. **Conclusion**: After analyzing all the options, only Option A (Ritina, epidermis, and brain) contains parts that are all derived from the ectoderm.

### Final Answer:
The correct answer is **Option A: Ritina, epidermis, and brain**.

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