How is biodiversity best defined?

Biodiversity is best defined as the variety of life within an ecosystem. This definition encompasses not just the number of different species present but also the variety of genetic differences within those species and the complex interactions between them within their environments. It reflects the richness of life forms and the ecological relationships that contribute to the resilience and stability of ecosystems.

The complexity and interactions among organisms, including their roles in food webs, nutrient cycling, and habitat structures, underscore the holistic nature of biodiversity. This broad definition captures the significance of maintaining natural habitats and ecological processes, highlighting the intricate balance necessary for sustaining life.

The other options, while related to aspects of biodiversity, do not fully encapsulate the concept. For instance, counting only the total number of species in a country fails to consider genetic variation and ecosystem interactions. Focusing on genetic variation within a single species overlooks the diversity found across different species and ecosystems. Evaluating the health status of a specific wildlife population does not represent biodiversity as a whole; it is just one aspect of understanding the broader ecological context.