Define living fossils. Give one example

Explanation

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

1. **Definition of Living Fossils:**
Living fossils are organisms that are still found in the current environment but possess primitive characteristics that have remained unchanged for millions or even billions of years. These organisms exhibit traits that were present in their ancestors, indicating a very slow rate of evolution.

2. **Characteristics of Living Fossils:**
- They have retained ancestral traits.
- They show minimal evolutionary changes over time.
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