Researchers recorded the tools found in three undisturbed layers.
| Age of layer | Tools recorded |
|---|---|
| 1.8 million years | Simple flakes with a small number of cutting edges |
| 0.5 million years | Hand axes shaped on both sides and more symmetrical |
| 0.1 million years | Blades, points and scrapers made for different tasks |
Explain what these records suggest about how the skills of the tool makers changed over time.
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.