IB Diploma Biology SL, topic A4
Ecosystems (Unity and diversity)
This group covers how new species arise and how biodiversity is being lost. A4.1 sets out the evidence for evolution and the process of speciation. A4.2 covers biodiversity, the causes of the current extinction crisis and the approaches used to conserve it.
Revision notes
Worksheet
FlashcardsSubtopics
Work through them in order. Each one has notes, exam questions and flashcards, and a PDF of each.
- 1Evolution and speciation Spec A4.1IB Biology A4.1: evolution as heritable change, evidence from sequences, selective breeding and homologous structures, and how species split.NotesQuestions 5Flashcards 15
- 2Conservation of biodiversity Spec A4.2IB Biology A4.2: biodiversity, causes of the sixth mass extinction and ecosystem loss, evidence for a biodiversity crisis, and conservation approaches.NotesQuestions 8Flashcards 16
Whole topic
When you have done the subtopics: test yourself on everything, or print the lot.