Darwin observed related species of finch on different islands. The finches had different beak shapes. Which explanation is consistent with natural selection?
Different food sources produced identical inherited beak shapes.
Finches changed their beaks by repeatedly using them.
Finches inherited beak changes acquired by their parents.
Different food sources favoured different inherited beak shapes.
44 exam-style questions on Edexcel GCSE Biology 4.1 Evolution and natural selection, covering 4.1.1 Work of Darwin and Wallace and 4.1.2 Resistant organisms and evolution. Each one has a worked solution and a mark scheme showing where the marks go.