IB Biology Syllabus 2025
The IB Biology curriculum is organized by themes (A-D) and levels of organization (1-4) in a "roadmap."
THEME |
1. MOLECULES |
2. CELLS |
3. ORGANISMS |
4. ECOSYSTEMS |
A. Unity and Diversity Common ancestry has given living organisms many shared features while evolution has resulted in the rich biodiversity of life on Earth. |
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B. Form and Function Adaptations are forms that correspond to function. These adaptations persist from generation to generation because they increase the chances of survival. |
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C. Interaction and Interdependence Systems are based on interactions, interdependence and integration of components. Systems result in emergence of new properties at each level of biological organization. |
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D. Continuity and Change Living things have mechanisms for maintaining equilibrium and for bringing about transformation. Environmental change is a driver of evolution by natural selection. |