A stone tool is found in a sediment layer that formed between 1.4 and 1.6 million years ago. A recent animal burrow passes through the layer. A seed inside the burrow is dated to 500 years ago.
Which conclusion is best supported?
the seed fixes the layer’s age; the tool must predate 1.6 million years
the seed fixes the tool’s age; the sediment must also be 500 years old
the seed may have entered later; the tool must be younger than 500 years
the seed may have entered later; its age need not be the tool’s age
40 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.