IB Biology Interaction and Interdependence Concepts
Interaction and Interdependence explains how cells, organisms and ecosystems exchange information, energy and matter through regulated relationships and environmental feedback.
Syllabus
First assessment 2025
Section
—
Level
HL
Exam analysis
Published Concept evidence in Interaction and Interdependence clusters around regulated processes, signalling, defence and ecological relationships. The recurring pattern is explaining how interactions control biological outcomes, from enzyme activity and energy transfer to population change and ecosystem cycling.
