A research team uses a database to compare dated anatomical evidence from hominin fossils.
| Age of fossils | Anatomical evidence |
|---|---|
| 3.2 million years | Small brain case; pelvis, knee and leg bones adapted for regular walking on two legs |
| 1.6 million years | Larger brain case |
Explain what the evidence suggests about the relative timing of adaptations for regular walking and an increase in brain-case size.
A researcher concludes that the hominin represented by the 1.6-million-year-old fossils was a direct descendant of the hominin represented by the 3.2-million-year-old fossils.
Explain whether the evidence supports this conclusion.
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.