The structures that remain separate with forming a layer is

Options

A. Epithelial cells
B. Muscle cells
C. Nervous cells
D. Glands

Answer

To solve the question, "The structures that remain separate with forming a layer is," we will analyze the options provided and determine which one fits the description.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for structures that remain separate and do not form a continuous layer. We need to evaluate each option to see which one fits this description.

2. **Evaluating Option 1: Epithelial Cells**:
- Epithelial cells form layers that line surfaces of organs and body cavities. They are tightly packed and do not remain separate.
- **Conclusion**: This option is incorrect.

3. **Evaluating Option 2: Muscle Cells**:
- Muscle cells (myocytes) are specialized for contraction and movement. They are organized into tissues but do not remain separate; they work together to form muscle fibers.
- **Conclusion**: This option is also incorrect.

4. **Evaluating Option 3: Nerve Cells (Neurons)**:
- Neurons are the longest cells in the body and serve as the basic unit of the nervous system. They consist of a cell body, dendrites, and an axon. Neurons do not form layers; they are separate entities that communicate through synapses.
- **Conclusion**: This option fits the description of remaining separate and not forming a layer. This is likely the correct answer.

5. **Evaluating Option 4: Glands**:
- Glands are made up of glandular cells that are involved in secretion. While they may have a structure, they do not remain separate in the same way that neurons do.
- **Conclusion**: This option is incorrect.

6. **Final Answer**: Based on the evaluation, the correct answer is **Option 3: Nerve Cells (Neurons)**, as they remain separate and do not form a continuous layer.