Two populations of a species are separated for a very long time. They evolve until they form two different species. How could scientists show that they are now two different species?
They live in different habitats from each other.
They are a different colour from each other.
They eat different types of food from each other.
They can no longer breed to produce fertile offspring.
122 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.