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A3.2.1 (HL)—Need for classification

Classification organizes biodiversity into agreed groups using shared traits, universal naming, hierarchy, domains, sequence evidence, and evolutionary origin for study.

Syllabus
First assessment 2025
Objective
A3.2.1
Level
HL

Concept essentials

  • Classification makes biodiversity easier to identify, compare, and study.
  • Scientific classification depends on agreed names and nested taxonomic groups.
  • Modern classification uses molecular evidence as well as visible characteristics.
  • Evolutionary origin helps determine natural groupings.
ConceptIB Biology HL