A whale flipper contains the same bones as a human arm. A fish fin does not contain these bones.
Whales and fish both live in water and both use their limbs for swimming.
Explain why the bones in a whale flipper suggest that whales are more closely related to humans than to fish.
The ancestors of whales lived on land and had legs.
Explain how the forelimbs of these ancestors could have changed into flippers over many generations.
40 exam-style questions on Edexcel GCSE Biology 4.2 Evidence for evolution and classification, covering 4.2.1 Fossil evidence for human evolution, 4.2.2 Stone tool evidence for human evolution, 4.2.3 Pentadactyl limb as evidence, and 4.2.4 Three domains classification. Each one has a worked solution and a mark scheme showing where the marks go.