Scientists record refined and crude tools from two undisturbed layers.
Table
| Layer | Age / million years | Total tools | Refined tools |
|---|---|---|---|
| P | 1.8 | 80 | 24 |
| Q | 0.9 | 40 | 24 |
Which conclusion is supported?
the proportion of refined tools doubled in the younger layer
the proportion of refined tools stayed constant between layers
the proportion of refined tools halved in the younger layer
the proportion of crude tools doubled in the younger layer
45 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.