Name three functional regions of a cell.

Explanation

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks for three functional regions of a cell.

2. **First Functional Region - Plasma Membrane**:
- The plasma membrane is the outermost layer of the cell.
- Its main functions include protecting the cell from the external environment, facilitating transportation of substances in and out of the cell, and enabling cell-to-cell communication.

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