Biogeochemical cycles
Topic 2.3 explores ecological niches, competitive exclusion, and key species interactions including predation, parasitism, mutualism, and competition. Students learn to analyse how interspecific relationships shape community structure and biodiversity — a frequent focus in IB ESS exam questions.
IB ESS · Topic 2.3
Sub-topics in Topic 2.3
2.3.1Biogeochemical cycles2.3.2Stores, sinks and sources2.3.3Organic and inorganic carbon stores2.3.4Carbon flows between stores2.3.5Carbon sequestration2.3.6Ecosystems as stores, sinks or sources2.3.7Fossil fuels2.3.8Agriculture and the carbon cycle2.3.9Oceans and carbon dioxide2.3.10Ocean acidification2.3.11Reducing human impacts on the carbon cycle