Scientists compare the forelimbs of two vertebrates. The features in the table are listed in order from the body to the end of each limb.
| Feature | Cat foreleg | Seal foreflipper |
|---|---|---|
| upper section | one long, narrow bone | one short, broad bone |
| lower section | two long, narrow bones | two short, broad bones |
| wrist | a group of small bones | a group of small bones |
| end of limb | five separate digits | five elongated digits |
| main use | walking and running on land | swimming in water |
Explain what the information suggests about the evolution of these forelimbs.
85 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.