What is common between peacock ,kangaroo and cobra ?

Options

A. Two pairs of limbs
B. Amnion
C. 4-Chambered heart
D. Homoiothermy

Answer

To determine what is common between a peacock, kangaroo, and cobra, we can analyze the given options step by step.

### Step 1: Understand the Organisms
- **Peacock**: A bird known for its colorful plumage.
- **Kangaroo**: A marsupial native to Australia, known for its powerful hind legs and ability to hop.
- **Cobra**: A type of snake known for its hood and venom.

### Step 2: Analyze the Options
1. **Two pairs of limbs**:
- Peacocks have two legs (not two pairs).
- Kangaroos have two pairs of limbs (two arms and two legs).
- Cobras have no limbs.
- **Conclusion**: Not common among all three.

2. **Mammal**:
- Peacocks are birds (not mammals).
- Kangaroos are mammals.
- Cobras are reptiles (not mammals).
- **Conclusion**: Not common among all three.

3. **Four-chambered heart**:
- Peacocks (birds) have a four-chambered heart.
- Kangaroos (mammals) have a four-chambered heart.
- Cobras (reptiles) have a three-chambered heart.
- **Conclusion**: Not common among all three.

4. **Homeothermia**:
- Homeothermia refers to the ability of an organism to maintain a constant internal body temperature.
- Peacocks, kangaroos, and cobras all have mechanisms to regulate their body temperature, although they belong to different classes of animals.
- **Conclusion**: This is common among all three.

### Final Answer
The common feature between peacock, kangaroo, and cobra is **homeothermia** (option 4).

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