There is a genetic variability among the populations and the individuals of the same species. species diversity-diversity among species in an ecosystem. Biodiversity hotspots are excellent examples of species diversity ecosystem diversity-diversity at a higher level of organization, the ecosystem.To do with the variety of ecosystems on Earth Biodiversity is not distributed evenly on Earth.he most straightforward definition is variation of life at all levels of biological organization[3]. A second definition holds that biodiversity is a measure of the relative diversity among organisms present in different ecosystems.