What are three functional region of a cell?

Explanation

**Step-by-Step Solution:**

1. **Identify the Three Functional Regions of a Cell:**
The three functional regions of a cell are the plasma membrane, cytoplasm, and nucleus.

2. **Explain the Plasma Membrane:**
The plasma membrane is the outermost covering of the cell. It surrounds the cytoplasm and provides protection. Its main functions include:
- Protection of the cytoplasm.
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