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

Explanation

To determine which set of animals shares a four-chambered heart, we can analyze the options provided:

### Step-by-Step Solution:

1. **Understand the Heart Structure:**
- A four-chambered heart consists of two atria and two ventricles. This structure is found in certain groups of animals, primarily birds and mammals.

2. **Examine the Options:**
- **Option 1:** Amphibian, Reptile, Bird
- Amphibians (e.g., frogs) have a three-chambered heart.
- Reptiles (e.g., snakes, lizards) generally have a three-chambered heart.
- Birds have a four-chambered heart.
- **Conclusion:** This option is incorrect.

- **Option 2:** Crocodile, Bird, Mammal
- Crocodiles, although reptiles, have a unique heart structure that is more advanced and has a four-chambered heart.
- Birds have a four-chambered heart.
- Mammals also have a four-chambered heart.
- **Conclusion:** This option is correct.

- **Option 3:** Crocodile, Lizard, Turtle
- Crocodiles have a four-chambered heart.
- Lizards and turtles, both reptiles, have a three-chambered heart.
- **Conclusion:** This option is incorrect.

- **Option 4:** Lizard, Mammal, Bird
- Lizards have a three-chambered heart.
- Mammals have a four-chambered heart.
- Birds have a four-chambered heart.
- **Conclusion:** This option is incorrect.

3. **Final Answer:**
- The only option where all animals have a four-chambered heart is **Option 2: Crocodile, Bird, Mammal**.

### Summary:
The correct answer is **Option 2: Crocodile, Bird, Mammal**, as all these animals share a four-chambered heart.