Learn how productivity, species diversity and soil depth change through ecological succession, including SL and HL distinctions and IB ESS exam guidance.

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2.4 Climate and biomes

What Causes a Tropical Cyclone and How Does Global Warming Affect Their Intensity?

Learn how warm oceans, low pressure, Coriolis force and latent heat create tropical cyclones, and why warming can intensify them in IB ESS.

2.5 Zonation, succession and change in ecosystems

What Is Ecological Succession?

Learn how ecological succession changes communities over time, including primary and secondary succession, seral stages, and IB ESS exam tips.

2.5 Zonation, succession and change in ecosystems

What's the Difference Between Primary Succession and Secondary Succession?

Learn how primary and secondary succession differ in soil, pioneer species, recovery speed, and named examples for IB ESS exam questions.

2.5 Zonation, succession and change in ecosystems

What Is the Concept of a Climax Community, and Why Has It Been Challenged?

Learn what a climax community means in IB ESS succession, why the concept is challenged, and how SL and HL students should explain it clearly in exams.

3.1 Biodiversity and evolution

What Is Biodiversity and at What Levels Does It Exist (Genetic, Species, and Ecosystem)?

Learn the IB ESS definition of biodiversity and distinguish genetic, species and ecosystem diversity using clear examples, terminology and exam advice.

2.5 Zonation, succession and change in ecosystems

How Does Human Activity Disrupt or Redirect Ecological Succession?

Learn how human activity resets, redirects, or arrests ecological succession, with IB ESS mechanisms, examples, terminology, and exam advice.

3.1 Biodiversity and evolution

How Does Natural Selection Drive Evolution?

Learn how natural selection causes evolution through variation, competition and differential reproduction, with an IB ESS example and exam advice.

3.1 Biodiversity and evolution

What Is Speciation?

Learn what speciation means in IB ESS, how reproductive isolation and natural selection produce new species, with a named example and precise exam guidance.

3.1 Biodiversity and evolution

What's the Difference Between Species Richness and Species Evenness?

Learn how species richness and species evenness differ, how both determine species diversity, and how to compare ecosystems in IB ESS exams.

3.1 Biodiversity and evolution

How Does Reproductive Isolation Lead to New Species?

Learn how reproductive isolation stops gene flow, allows populations to diverge, and eventually produces new species through speciation in IB ESS HL.

3.1 Biodiversity and evolution

Why Is Biodiversity Distributed Unevenly Across the Planet (Biodiversity Hotspots)?

Learn why biodiversity varies globally, how climate, isolation and evolutionary history create hotspots, and how to answer IB ESS HL exam questions.

3.1 Biodiversity and evolution

How Do You Calculate Simpson's Reciprocal Diversity Index?

Learn how to calculate Simpson's reciprocal diversity index from species abundance data, interpret the result, and avoid common IB ESS exam mistakes.

3.1 Biodiversity and evolution

How Do Mutation and Sexual Reproduction Increase Genetic Diversity?

Learn how mutation creates new alleles while sexual reproduction reshuffles alleles, increasing genetic diversity in populations for IB ESS HL exams.

3.1 Biodiversity and evolution

How Does Artificial Selection Reduce Genetic Diversity?

Learn how artificial selection narrows gene pools, increases homozygosity and lowers resilience, with an IB ESS HL case study and exam guidance.

3.1 Biodiversity and evolution

Why Do Mass Extinctions Lead to Rapid Speciation Afterward?

Learn why mass extinctions create vacant ecological niches, reduce competition, and trigger adaptive radiation and rapid speciation in IB ESS HL evolution.

3.1 Biodiversity and evolution

How Is Earth's History Divided Into Geological Epochs?

Learn how scientists divide Earth's history using the geological time scale, fossil evidence, boundary markers and epochs for IB ESS HL exams.

3.2 Human impact on biodiversity

What Human Activities Threaten Biodiversity (Habitat Loss, Invasive Species, and Pollution)?

Learn how habitat loss, invasive species, and pollution reduce biodiversity, with IB ESS mechanisms, named examples, and focused exam technique.

3.1 Biodiversity and evolution

What Is the Anthropocene and Why Is It a Proposed Geological Epoch?

Learn why the Anthropocene was proposed as a geological epoch, the evidence of human impacts, and its status in IB ESS biodiversity and evolution.

3.2 Human impact on biodiversity

How Does the IUCN Assess Global Conservation Status?

Learn how the IUCN Red List uses population size, trends, breeding potential, geographic range and known threats to assess global extinction risk for species.

3.2 Human impact on biodiversity

How Do Invasive Alien Species Reduce Local Biodiversity?

Learn how invasive alien species reduce local biodiversity through competition, predation and disease, with named IB ESS examples and exam technique.

3.2 Human impact on biodiversity

What Is the “Tragedy of the Commons”?

Learn how the tragedy of the commons causes shared resources to be overexploited, with an IB ESS mechanism, example, solutions, and exam advice.

3.2 Human impact on biodiversity

Why Is There Conflict Between Exploitation and Conservation in KBAs?

Learn why resource exploitation conflicts with biodiversity conservation in Key Biodiversity Areas, with stakeholder perspectives and an ESS case study.

3.2 Human impact on biodiversity

How Does the Planetary Boundary “Loss of Biosphere Integrity” Relate to Species Extinction?

Learn how species extinction reduces biosphere integrity, weakens ecosystem resilience, and indicates a crossed planetary boundary in IB ESS exams.

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