Scientists do not have a complete fossil record for most species. Which statement explains why?
Fossils can only be formed from the bones of large animals.
Very old fossils have all evolved into fossils of new species.
Fossils are only found in rocks on the surface of the Earth.
Many soft-bodied organisms decayed before they could form fossils.
122 exam-style questions on OCR GCSE Biology 5.2 Natural selection and evolution, covering 5.2.1 Genetic variation within a population, 5.2.2 Developments in classification systems, 5.2.3 How evolution occurs through natural selection, 5.2.4 Evolution as change over time, 5.2.5 Evidence for evolution, and 5.2.6 Darwin and Wallace. Each one has a worked solution and a mark scheme showing where the marks go.