An online animal catalogue has a section called ‘animals with shells’.
Which finding would show that the section does not represent a natural classification?
Some animals in the section are more closely related to animals without shells than to other animals in the section.
Scientists have not yet sequenced the DNA of every animal that is listed in the section.
The animals in the section differ in body size, in colour and in the type of food that they eat.
Some animals in the section live in the sea, while others live in fresh water or on land.
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.