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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