Peppered moths can be pale or dark in colour. In areas where tree trunks were darkened by soot, the number of dark moths increased. Which statement explains why?
Dark moths were less likely to be seen and eaten by birds.
Pale moths changed colour so that they matched the trees.
Soot caused mutations that turned the pale moths dark.
Dark moths were better at finding food on the dark trees.
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.