Which one of the following sets of animals share a four chambered heart ?

Options

A. Amphibian, Reptiles, Birds
B. Crocodiles, Birds, Mammals
C. Crocodiles, Lizards, Turtles
D. Lizards, Mammals, Birds

Answer

To determine which set of animals shares a four-chambered heart, we can follow these steps:

### Step 1: Understand the Structure of a Four-Chambered Heart
A four-chambered heart consists of:
- **Two atria** (upper chambers)
- **Two ventricles** (lower chambers)

This structure allows for efficient separation of oxygenated and deoxygenated blood.

### Step 2: Identify Animals with a Four-Chambered Heart
The animals known to have a four-chambered heart include:
- **Mammals**
- **Birds**
- **Some reptiles** (notably, **crocodiles**)

### Step 3: Analyze the Given Options
Now, let's analyze the options provided in the question:

1. **Amphibians, reptiles, birds**:
- Amphibians do not have a four-chambered heart. This option is incorrect.

2. **Crocodiles, birds, mammals**:
- All three of these animals have a four-chambered heart. This option is correct.

3. **Crocodiles, lizards, turtles**:
- While crocodiles have a four-chambered heart, lizards and turtles do not. This option is incorrect.

4. **Lizards, mammals, birds**:
- Lizards do not have a four-chambered heart. This option is incorrect.

### Step 4: Conclusion
The correct answer is the second option: **Crocodiles, birds, and mammals** share a four-chambered heart.

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