What is a cell ?

Explanation

### Step-by-Step Solution:

1. **Definition of a Cell**:
A cell is defined as a membrane-bound structure that serves as the fundamental unit of life. It is the basic building block of all living organisms.

2. **Structure of a Cell**:
A typical cell contains several components:
- **Cell Membrane**: This is the outer layer that encloses the cell, providing structure and regulating what enters and exits the cell.
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