Human arms, bat wings and whale flippers contain corresponding bones in the same basic arrangement. Which evidence would most strengthen the explanation that this arrangement reflects shared ancestry?
Similarities in inherited DNA sequences across the three groups.
Similarities in adult body mass across the three groups.
Similarities in current food sources across the three groups.
Similarities in movement speed across the three groups.
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.