Speciation, continued

• Limitations of biological species concept- inadequate for extinct forms of life or for organisms that are asexual in reproduction
• Other species concepts
  • morphological- based on measurable physical features
  • recognition- species defined by characteristics that maximize successful mating
  • cohesion- focuses on mechanisms that maintain species as distinct phenotypic entities
  • ecological- define species on basis of where they live and what they do
  • evolutionary- define species as sequence of ancestral and descendant populations that are evolving independently of other such groups

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