What best defines the term biodiversity in scientific context?

In a scientific context, biodiversity is best defined as the total diversity of life forms at multiple levels of biological organization, including genetic diversity, species diversity, and ecosystem diversity. It refers not only to the number of different species present in a region but also to the variation of genes within those species and the range of ecosystems they inhabit. This definition emphasizes both the composition and interactions of living organisms, highlighting biodiversity as a dynamic system that supports ecological stability, evolutionary processes, and environmental resilience.