1. Genetic diversity refers to any variation in the nucleotides, genes, chromosomes, or whole genomes of organisms (the genome is the entire complement of DNA within the cells or organelles of the organism).
2. Species diversity is a measure of the diversity within an ecological community that incorporates both species richness (the number ofspecies in a community) and the evenness of species' abundances.Species diversity is one component of the concept of biodiversity.
3. Ecosystem diversity refers to the diversity of a place at the level of ecosystems. The term differs from biodiversity, which refers to variation in species rather than ecosystems.