IB ESS — Topic 2.3

Habitat, niche and interactions

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.

Sub-topics in Topic 2.3

2.3.1Niches2.3.2Population interactions

Study Topic 2.3: Habitat, niche and interactions

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