The origin of new species from an existing species is called_____.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the term that describes the process of new species originating from an existing species.

2. **Identifying Key Concepts**: The key concepts here are "origin of new species" and "existing species." This indicates a process of change and divergence in species.

3. **Defining the Term**: The term that describes the origin of new species from an existing species is known as "speciation."

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