Scientists compare three hominin fossils from undisturbed rock layers. For each fossil, they record how many skull and tooth features match those of fossil T.
| Fossil | Age (million years ago) | Skull features matching fossil T (out of 6) | Tooth features matching fossil T (out of 6) | Brain-case volume (cm³) |
|---|---|---|---|---|
| R | 2.8 | 3 | 4 | 500 |
| S | 2.0 | 5 | 5 | 650 |
| T | 1.4 | 6 | 6 | 800 |
Evaluate the claim that fossil S must be a direct ancestor of fossil T.
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.