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Darwin's Lost Fossils Found In Desk Drawer

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Darwin's Lost Fossils Found In Desk Drawer

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Darwin's Lost Fossils Found In Desk Drawer

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  1. Darwin's Lost Fossils Found In Desk Drawer

  2. Evolution is how species have evolved from simple life forms

  3. Theories of Evolution • Lamarck believed in acquired characteristics. • The characteristics that help that organism to survive are passed to their offspring. • So if your parents are body builders then you are born that way.

  4. Theories of Evolution • Darwin set out in 1831 on a voyage. • The galapagos islands he saw different features on a variety of finches

  5. The islands

  6. Theories of Evolution

  7. Survival of the fittest • Only offspring with the genes that best suit their habitat will stay alive and breed. • This is natural selection.

  8. Fossils are evidence to show natural selection in action.

  9. A fast runner on hard ground • It has one toe forming a hoof • Looks more like the modern horse with one hoof • Slightly bigger • Walks mainly on one toe • Has 3 toes on the ground • To run faster on drier ground • Small • Lives on swampy land • Toes are well spread

  10. Predators • The dodo was a flightless bird. • New predators arrived on shore and they could not escape.

  11. Environmental changes • Scientists believe a big climate change caused dinosaurs to become extinct due to a meteorite crashing into the earth.

  12. Competition • A mutation can give one animal an advantage over another. • Or sometimes one species can not compete with another as they are better adapted to their environment, causing extinction.

  13. Diseases • Diseases can wipe out a whole species quickly when the population live close together.

  14. Predators Competition Environmental changes Diseases Extinction

  15. What are the two different theories proposed by Lamarck and Darwin, describe them. • What is the theory of evolution? • Describe how finches helped Darwin to develop his theory. • What evidence do we have to prove evolution has taken place? • Explain why Darwin’s theory was only accepted gradually (give two reasons). • Describe how natural selection works. Give an example of natural selection. • What is a mutation? And how can this be advantageous for an organisms?