Biology (evolution theories& natural selection)

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    • Darwin's& his theory of evolution
      • life on Earth has changed over geological time
      • Scientists believe this is the reason why all living things on Earth exist today
      • The theory is supported by evidence from fossils, and by the rapid changes that can be seen to occur in microorganisms such as antibiotic-resistant bacteria
      • Many species have become extinct in the past and the extinction of species continues to happen
      • His theory went against religious views, that God had made all the animals and plants.
        • Darwin did not have enough evidence at the time to convince many scientists
          • it took 50 years after Darwin’s theory was published to discover how inheritance and variation worked.
      • Darwin's theory caused controversy among his contemporaries and his ideas were only gradually accepted
        • Although some people still don't accept it today.
    • Lamarck& his theory of evolution
      • Jean-Baptiste Lamarck was a French scientist who developed an alternative theory of evolution at the beginning of the 19th century
      • His theory involved two ideas
        • A characteristic which is used more and more by an organism becomesbigger and stronger, and one that is not used eventually disappears
        • Any feature of an organism that is improved through use is passed to its offspring
    • Natural selection
      • The theory of evolution states that evolution happens by natural selection. The key points are that......
        • individuals in a species show a wide range of variation
        • this variation is because of differences in their genes
        • individuals with characteristics most suited to the environment are more likely to survive and reproduce
        • the genes that allow these individuals to be successful are passed to their offspring


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