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IB Biology SL A4.2.8 EDGE of Existence Question Bank

Practise IB Biology SL A4.2.8 by explaining how EDGE combines extinction risk with evolutionary distinctiveness to prioritise conservation action.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Explain how EDGE combines extinction risk with evolutionary distinctiveness when prioritising species.
  • Interpret programme maps and evidence to identify why particular species receive conservation attention.

A4.2.8—EDGE of Existence programme question 1

[Maximum number: 2]

Describe the role of the EDGE of Existence programme.

Chimpanzees and bonobos are different species of primate. It is thought that neither species can swim. The map shows the relative locations of chimpanzees and bonobos in Africa.

Figure for Question A4.2.8—EDGE of Existence programme question 1 — IB Biology SL

Evidence suggests that the level of the Congo River was lower during one period in the past. At this time, chimpanzees could have migrated across.

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