What are the basic structural units and the building blocks of all living organism?

Options

A. Tissue
B. Cell
C. Organ
D. None of these

Explanation

To answer the question "What are the basic structural units and the building blocks of all living organisms?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the basic structural units and building blocks of all living organisms. This means we need to identify what fundamental components make up living organisms.

2. **Identifying Options**: The question may provide multiple choices. Common options could include:
- Tissue
- Cell
- Organ
- None of these

3. **Analyzing Each Option**:
- **Tissue**: Tissues are groups of similar cells that work together to perform a specific function. Therefore, tissues are not the basic units but rather a collection of cells.
- **Cell**: Cells are the smallest units of life and are considered the basic structural units of all living organisms. They perform all necessary functions of life.
- **Organ**: Organs are structures composed of two or more types of tissues working together. Hence, they are not the basic units but rather a higher level of organization.
- **None of these**: This option would imply that none of the previous options are correct, which is not the case since cells are indeed the basic units.

4. **Conclusion**: Based on the analysis, the correct answer is that the cell is the basic structural unit and the building block of all living organisms.

### Final Answer:
The basic structural units and the building blocks of all living organisms are **cells**.