Which factor does NOT contribute to species diversity?

Homogeneity of environments does not contribute to species diversity because it implies a lack of variation in ecological conditions. When environments are uniform, there are fewer niches and limited opportunities for species to adapt and evolve differently. High species diversity often arises from heterogeneous environments that provide a wide range of habitats and resources, allowing various species to thrive and coexist.

In contrast, geographical isolation can lead to speciation as populations adapt to different environments over time. Limited resources can create competition, which may drive diversification in species that adapt to exploit different resources. Natural selection promotes adaptations that can lead to the emergence of new species or variations within a species. Hence, while diversity can be influenced by many factors, homogeneity actively works against it by reducing the ecological complexity necessary for diverse life forms to coexist.