________ is the basic structural, functional and hereditary unit of all living organisms.

Explanation

**Step-by-Step Text Solution:**

1. **Identify the Question**: The question asks for the term that describes the basic structural, functional, and hereditary unit of all living organisms.

2. **Understanding the Concepts**:
- **Structural Unit**: This refers to the physical components that make up living organisms.
- **Functional Unit**: This indicates that the unit performs essential life processes.
- **Hereditary Unit**: This means that the unit carries genetic information that can be passed on to the next generation.
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