Darwin and Wallace both developed their theories of evolution by natural selection after studying organisms on islands. Which statement best explains why islands are particularly suitable for observing the effects of natural selection?
Island ecosystems have no predators, allowing all offspring to survive and reproduce.
Geographic isolation limits gene flow, magnifying the adaptation of populations to unique local environments.
High levels of migration between islands prevent new species from forming too quickly.
Island environments are completely stable and do not experience any ecological changes.
38 exam-style questions on OCR GCSE Biology 5.2 Natural selection and evolution, covering 5.2.1 Genetic variation within a population, 5.2.2 Developments in classification systems, 5.2.3 How evolution occurs through natural selection, 5.2.4 Evolution as change over time, 5.2.5 Evidence for evolution, and 5.2.6 Darwin and Wallace. Each one has a worked solution and a mark scheme showing where the marks go.