Name two homologous structures in vertebrates. How do such organs help in understanding evolutionary relationship ?

Explanation

**Step-by-Step Solution:**

1. **Identify Homologous Structures:**
- Two examples of homologous structures in vertebrates are:
- Limbs of birds and mammals (e.g., the forelimbs of humans and the wings of birds).
- Limbs of reptiles and amphibians (e.g., the forelimbs of frogs and the forelimbs of lizards).

2. **Define Homologous Structures:**
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