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IB Biology HL A4.2.2 Current Vs Past Biodiversity Questions

Compare biodiversity across time and judge how sampling gaps and incomplete records limit conclusions.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Discuss evidence for a decline or increase in biodiversity when comparing communities sampled in different periods.
  • Evaluate uncertainty in current-versus-past biodiversity comparisons caused by unequal sampling effort, duration or missing historical records.

Learn this topic

Study A4.2.2—Current vs. past biodiversity conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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