Define biodiversity.

Biodiversity encompasses the variety of species, genetic variability within those species, and the range of ecosystems present in a particular area. This definition highlights the importance of not only the different kinds of organisms that exist (species diversity) but also the genetic differences among individuals of the same species (genetic diversity). Additionally, it emphasizes the varying types of habitats and ecosystems, which contribute to overall biodiversity. This diversity is crucial for ecosystem resilience, providing the necessary resources for survival, adaptability, and evolution within a changing environment.

The total number of organisms in a specific habitat pertains more to population density rather than biodiversity. While the interactions of organisms within an ecosystem describe ecological relationships, they do not encompass the broader concept of biodiversity. Lastly, evolutionary changes in isolated populations focus on processes such as speciation and do not capture the multiple facets of biodiversity that include species and genetic diversity within and across ecosystems.