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Explore the fundamental question of species definition in this 26-minute lecture that examines three major approaches to classifying organisms. Learn about the morphospecies concept, which groups organisms based on physical characteristics and structural similarities. Discover the biological species concept that defines species based on reproductive compatibility and the ability to produce fertile offspring. Understand the phylogenetic species concept that uses evolutionary relationships and genetic lineages to determine species boundaries. Compare the strengths and limitations of each approach while gaining insight into why defining species remains one of biology's most challenging and debated topics.
