A fossil of a soft-bodied worm was found. The whole shape of the worm had been preserved. Which condition allowed this fossil to form?
The worm was buried where there was no oxygen, so the worm did not decay
The worm was buried in warm, wet soil that contained many microorganisms
The worm was covered by minerals, which replaced its bones as they decayed
The worm walked across some soft mud and left a preserved trace behind it
40 exam-style questions on AQA GCSE Biology 6.3 The development of understanding of genetics and evolution, covering 6.3.1 Theory of evolution, 6.3.2 Speciation, 6.3.3 The understanding of genetics, 6.3.4 Evidence for evolution, 6.3.5 Fossils, 6.3.6 Extinction, and 6.3.7 Resistant bacteria. Each one has a worked solution and a mark scheme showing where the marks go.