What is Biodiversity?

This module provides an introduction to biodiversity -- the variety of life on Earth, from genes to ecosystems, and the ecological and evolutionary processes that sustain it. Biodiversity is classified at many levels, from genetic diversity to species diversity to ecosystem diversity. Biodiversity is also mapped over 'ecoregions,' categorized based on climate, vegetation, and altitude. In relation, the study of biogeography looks at the distribution of organisms in space, and through time.