_________ is a group of the basic entities of living organisms that are specialized to perform specific functions.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a term that describes a group of basic entities in living organisms that are specialized for specific functions.

2. **Identifying the Key Term**: The term that fits this description is "tissue".

3. **Defining Tissue**: Tissue is defined as a group of cells that have a similar structure and work together to perform a specific function.

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