Which statement most accurately defines biodiversity?

Biodiversity encompasses the variety of organisms at all levels in an ecosystem, which includes not just the number of different species present but also the genetic diversity within those species and the diversity of ecosystems themselves. This definition recognizes that biodiversity is a complex and multi-faceted concept that includes species richness and evenness, as well as the ecological roles and interactions among organisms within their environments. By considering the diversity of life forms and their relationships within ecosystems, this definition captures the essence of biodiversity's importance to ecosystem function and resilience. A healthy level of biodiversity is crucial for ecosystem stability, and it contributes to the biological health necessary for sustaining life on Earth.