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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.
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GENETIC DIVERSITY ⇒ Genetic diversity is the variation of heritable characteristics present in a population of the same species. It serves an important role in evolution by allowing a species to adapt to a new environment and to fight off parasites.

SPECIES DIVERSITY⇒ Species diversity is the variety of species in a given region or area. The degree of species diversity in any area can be determined by counting the number of species present in any area. Species diversity is important in that it prevents inbreeding.

ECOSYSTEM DIVERSITY⇒ Ecosystem diversity implies the existence of different species within an ecosystem. It can also be defined as the degree of variations among the life forms in an ecosystem or planet.
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