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 need to analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understand Heart Chambers**:
- The heart can have two, three, or four chambers.
- **Two-chambered hearts** are found in **amphibians** (e.g., frogs).
- **Three-chambered hearts** are typical of **reptiles** (e.g., lizards, turtles), with the exception of crocodiles.
- **Four-chambered hearts** are present in **birds** and **mammals**, and notably, **crocodiles** also have a four-chambered heart, making them an exception among reptiles.

2. **Evaluate Each Option**:
- **Option 1**: Amphibians, reptiles, birds
- Amphibians have a 2-chambered heart, reptiles have a 3-chambered heart, and birds have a 4-chambered heart.
- **Conclusion**: This option is incorrect.

- **Option 2**: Crocodile, bird, mammals
- Crocodiles have a 4-chambered heart, birds have a 4-chambered heart, and mammals have a 4-chambered heart.
- **Conclusion**: This option is correct.

- **Option 3**: Crocodile, lizard, turtle
- Crocodiles have a 4-chambered heart, but lizards and turtles have a 3-chambered heart.
- **Conclusion**: This option is incorrect.

- **Option 4**: Lizard, mammals, birds
- Lizards have a 3-chambered heart, while mammals and birds have a 4-chambered heart.
- **Conclusion**: This option is incorrect.

3. **Final Answer**: The correct answer is **Option 2: Crocodile, bird, mammals**, as all these animals share a four-chambered heart.