Explanation:

- Option 1: Herpetology

- Herpetology is the branch of zoology that focuses on the study of amphibians and reptiles.

- It encompasses the biology, behavior, and conservation of these animals.

- This is the correct answer.

- Option 2: Ethology

- Ethology is the study of animal behavior, particularly in natural environments.

- It examines how animals interact with each other and their environment.

- Option 3: Mammalogy

- Mammalogy is the study of mammals.

- It includes their evolution, diversity, and ecology.

- Option 4: Morphology

- Morphology deals with the structure and form of organisms.

- It applies to various branches of biology, not specifically to amphibians.