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Bergey's Manual of Systematic Bacteriology groups bacteria into species according to their

  • A.nutritional requirement
  • B.phylogenetic relationships
  • C.pathogenic properties
  • D.morphology

Answer: B

The Manual groups bacteria by phylogenetic relationships.

The second edition of Bergey's Manual of Systematic Bacteriology arranges prokaryotes in a phylogenetic framework built mainly on 16S rRNA sequence comparisons, so that taxa reflect evolutionary relatedness.

Nutritional requirements, pathogenic properties and morphology are phenotypic characters. They are still used to describe and identify organisms (Bergey's Manual of Determinative Bacteriology relies on them), but they are not the basis of the classification in the Systematic manual.

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