The functional unit of life is called ________

Options

A. cell
B. egg
C. nucleus
D. none of these

Answer

The functional unit of life is called **Cell**.

### Step-by-Step Solution:

1. **Understanding Life**: Life is associated with living organisms, which are made up of various components. The basic building block of all living organisms is the cell.

2. **Definition of a Cell**: A cell is defined as the smallest structural and functional unit of an organism. It is the basic unit that carries out all the functions necessary for life.

3. **Functional Unit**: The term "functional unit" refers to the role that a cell plays in the life of an organism. Cells perform essential functions such as metabolism, energy production, growth, and reproduction.

4. **Evaluating Options**:
- **Option 1: Cell** - This is the correct answer because it is the fundamental unit of life.
- **Option 2: Egg** - An egg is a reproductive structure but not a functional unit of life in the same sense as a cell.
- **Option 3: Nucleus** - The nucleus is an organelle within a cell and not the entire functional unit.
- **Option 4: None of these** - This option is incorrect since we have already identified the correct answer.

5. **Conclusion**: Based on the evaluation, the correct answer is that the functional unit of life is called a **Cell**.