Examples of Homologous organs are

Options

A. wing of insects and bat
B. gills of fish and lungs of rabbit
C. pectoral fins of fish and fore limbs of horse
D. wings of grassphopper and crow

Explanation

### Step-by-Step Solution:

1. **Definition of Homologous Organs**:
Homologous organs are defined as organs that have the same origin but perform different functions. This indicates that they have evolved from a common ancestor.

2. **Characteristics of Homologous Organs**:
- Same origin: They develop from the same embryonic tissues.
- Different functions: Although they may look different and serve different purposes, their structural similarities indicate a shared ancestry.

3. **Examples of Homologous Organs**:
- **Forelimbs of Mammals**: The forelimbs of various mammals such as humans, whales, and bats are homologous.
- **Human Arm**: Used for manipulation and grasping.
- **Whale Flipper**: Adapted for swimming.
- **Bat Wing**: Used for flying.
- **Pectoral Fins of Fish and Forelimbs of Amphibians**:
- **Pectoral Fins of Fish**: Used for swimming.
- **Forelimbs of Frogs**: Used for jumping and swimming.

4. **Conclusion**:
The presence of homologous organs in different species suggests that these species share a common ancestor, highlighting the concept of evolutionary biology.