What percentage of the living species of animals is threatened?

Explanation

To determine the percentage of living species of animals that are threatened, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Threatened Species**:
- Threatened species are those that are at risk of extinction. This includes species that are classified as endangered or vulnerable.

2. **Identify the Causes of Threats**:
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