Fossils 0.0 / 5 ? BiologyEvolution, extinction and natural selectionGCSEAQA Created by: HopeCreated on: 18-04-14 15:54 Define: Fossils The preserved remains or traces of dead organisms which are found in rocks 1 of 11 How can fossils be formed? Hard body parts, Parts of animals that havent decayed and Casts or impressions 2 of 11 Complete this sentence: fossils of the simplest organisms are.... Found in the oldest rocks 3 of 11 Complete this sentence: Fossils of the complex organisms are... Found in the newest rocks 4 of 11 How does the fossil record support the theory of evolution? The simplest life forms have gradually evolved into more complex ones 5 of 11 How can scientists gain information from fossils? They can learn how much or little different organisms have changed over time 6 of 11 How can new species arise? Isolation, Genetic Variation, Natural Selection and Speciation 7 of 11 Define: Isolation Two populations of a species become seperated e.g. geographically 8 of 11 Define: Genetic Variation Each population has a wide range of alleles that control their characteristics 9 of 11 Define: Natural Selection In each population, the alleles that control the characteristics which help the organisms to survive are selected 10 of 11 Define: Speciation The populations become so different that sucessful interbreeding is no longer possible 11 of 11
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