The table shows evidence from three fossil populations.
Table
| Population | Age / million years | Evidence of upright walking |
|---|---|---|
| P | 4.2 | pelvis not preserved |
| Q | 3.6 | pelvis adapted for upright walking |
| R | 2.5 | pelvis adapted for upright walking |
Which conclusion is justified?
upright walking began at 2.5 million years ago; its first appearance is established
upright walking began at 3.6 million years ago; its first appearance is established
upright walking was absent at 4.2 million years ago; its first appearance is uncertain
upright walking was present by 3.6 million years ago; its first appearance is uncertain
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.