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IB ESS 2.1.26 (HL) Clades & evolutionary classification

IB ESS 2.1.26 (HL) Clades & evolutionary classification
IB Environmental Systems and Societies syllabusESS SL/HLFirst assessment 2026

Practise using clades to explain evolutionary relationships, shared ancestry and classification within a taxonomic group.

How this is tested

  • interpret a clade to show how members share a common evolutionary ancestor
  • distinguish clade-based classification from simple similarity between species
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