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• The species is the most fundamental unit of biological classification.
• The species is the most fundamental unit in taxonomy and ranks at the base of the biological classification hierarchy.
• In biological classification, each taxonomic level is nested within the level above it, meaning a genus contains one or more species, a family contains one or more genera, and an order contains one or more families.
• Scientists categorize species based on their similarities, and the more similarities two species share, the more classification groups they will share.