What term describes all the animal life in a particular region?

The term that describes all the animal life in a particular region is "fauna." This encompasses the diverse species of animals that inhabit a specific area, including their behaviors, interactions, and roles within the ecosystem. Fauna is commonly used in ecology and biology to categorize and study various animal species within a defined geographical context.

In contrast, the term "flora" refers specifically to plant life, which distinguishes it from fauna. "Succession" pertains to the process of ecological change and community replacement over time, while "conservation" relates to the protection and management of biodiversity, habitats, and natural resources. Understanding these terms is crucial in the study of ecosystems and biodiversity, as they provide a framework for examining the relationships between different organisms and their environments.