What is the total substance of a living cell called?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the term that refers to the total substance of a living cell.

2. **Identifying the Key Term**: The total substance of a living cell is known as "protoplasm."

3. **Components of Protoplasm**: Protoplasm consists of two main components:
- **Cytoplasm**: The jelly-like substance that fills the cell and contains various organelles.
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