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IB Biology HL A4.2.8 Edge of Existence Programme Questions

Explain how EDGE combines phylogenetic uniqueness and IUCN extinction risk to prioritise species and prevent disproportionate loss of evolutionary history.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Use phylogenetic uniqueness and IUCN extinction risk to prioritise evolutionarily distinct, endangered species.
  • Explain how EDGE prioritisation helps prevent disproportionate loss of evolutionary history.

IB Biology HL A4.2.8 Edge of Existence Programme Questions question 1

[Maximum number: 2]

The graph shows the change in forest area in Greater Mekong countries in Southeast Asia between 1973 and 2009. This was mainly due to deforestation.

Figure for Question IB Biology HL A4.2.8 Edge of Existence Programme Questions question 1 — IB Biology HL

The EDGE of Existence programme measures Evolutionary Distinctness (ED) and Globally Endangered status (GE).

Outline the importance of the EDGE of Existence programme.

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