Evolution

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  • EVOLUTION
    • Evidence
      • Fossils
        • Pieces of rock and minerals that preserve the skeletons of organisms.
        • By studying fossils, scientists can learn how much (or how little) organisms have changed as life developed on Earth. However, many early forms of life were soft-bodied - and have left few traces behind.
    • Fossil Record
      • By studying fossils, scientists can learn how much (or how little) organisms have changed as life developed on Earth. However, many early forms of life were soft-bodied - and have left few traces behind.
      • Horses have a good fossil record.
        • Horses have evolved from a multi toed organism to a hooves.
    • Extinction
      • If a creature is poorly adapted to it's environment, it could die before it reproduces. So the population will decrease then become extinct.
      • Changes in environment can cause extinction.
        • Climate Change.
        • New diseases.
        • New predators.
        • New competitors.
    • New species
      • Isolation. This is where two populations of the same species become geographically separated.
      • Genetic variation. Where each population has a wide range of alleles that control their characteristics.
      • Natural selection. Where the alleles which help an organism to survive are selected in each population.
      • Speciation. Where the population becomes so different that successful interbreeding can't happen any more.

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