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DARWIN’S THEORY of NATURAL SELECTION (Survival of the Fittest)

DARWIN’S THEORY of NATURAL SELECTION (Survival of the Fittest). In this section you will want to find the answers for:. HOW DID DARWIN EXPLAIN THE DIFFERENCES BETWEEN SPECIES ON THE GALAPAGOS ISLANDS AND ON MAINLAND SOUTH AMERICA?. HOW DOES NATURAL SELECTION LEAD TO EVOLUTION?.

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DARWIN’S THEORY of NATURAL SELECTION (Survival of the Fittest)

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  1. DARWIN’S THEORYof NATURAL SELECTION (Survival of the Fittest)

  2. In this section you will want to find the answers for: HOW DID DARWIN EXPLAIN THE DIFFERENCES BETWEEN SPECIES ON THE GALAPAGOS ISLANDS AND ON MAINLAND SOUTH AMERICA? HOW DOES NATURAL SELECTION LEAD TO EVOLUTION? HOW DO NEW SPECIES FORM?

  3. In 1831, Charles Darwin set sail on the HMS Beagle for a 5 year trip around the world Darwin collected and studied numerous marine organisms during this famous voyage...

  4. Observations he made on the Beagle expedition also provided him with the ideas that he later used to formulate his theory of evolution and natural selection.

  5. VOCABULARY SCIENTIFIC THEORY: a well tested concept (idea) that explains a wide range of observations What is the difference between an idea, theory and fact? SPECIES: Group of similar organisms that can mate and produce offspring

  6. DARWIN’S THEORY: Species gradually change over many generations and become better adapted to new conditions

  7. THE GALAPOGOS ISALNDS ARE A GROUP OF VOLCANIC ISLANDS

  8. HOW DID DARWIN THINK PLANTS...

  9. ...AND ANIMALS ORIGINALLY CAME TO GALAPAGOS ISLAND?

  10. Ancestors of today’s plants & animals on the islands were brought from the mainland by wind, currents, or on floating debris...

  11. ONCE THEY REACHED ILSANDS, THEY REPRODUCED & OFFSPRING BECAME DIFFERENT FROM MAINLAND RELATIVES DUE TO RESOURCES AVAILABLE. Island Turtles Mainland Turtle

  12. THIS BRINGS US TO DARWIN’S THEORY OF NATURAL SELECTION

  13. Natural Selection Individuals that are better adapted to their environment are more likely to survive.

  14. SURVIVAL OF THE FITTEST WHAT ARE FACTORS THAT AFFECT SURVIVAL? • Differences in species (variations) • Over production of same species • Competition for resources

  15. SO…. HOW DOES THIS APPLY TO THE GALAPAGOS ISLANDS?

  16. Organisms that were on the Islands first had NO competition for resources (food, shelter, H2O) because no other species was there.

  17. Darwin studied finches found on these islands. This played an important role in his recognition of the evolutionary process.

  18. by studying the finches - Darwin showed how species are related to other species

  19. ...And over long periods of time natural selection can lead to evolution. VARIATIONS IN ORGANISMS GRADUALLY ACCUMULATE WHILE UNFAVORABLE ONES DISAPPEAR. HOW?

  20. As you can see in the next photos, Darwin's finches share similar size color, and habits - the difference is size and shape of their beak.

  21. The FINCHES

  22. WARBLER FINCHES

  23. Lava Finch Galapagos Volcanoes

  24. WHAT ARE SOME OTHER WAYS NEW SPECIES COULD HAVE FORMED? CONTINENTAL DRIFT

  25. SEPARATION by: RIVERS

  26. SURVIVAL of the FITTEST

  27. How is each organism suited to play a certain role in a certain habitat? ADAPTATIONS: inherited features that let organisms survive & produce young

  28. Camouflage: Adaptations that allow organisms to blend in w/environment.

  29. What’s right w/these pics?

  30. What’s the problem here?

  31. What’s wrong w/this pic?

  32. ANOTHER ADAPTATION SEEN IN ANIMALS AND PLANTS: MIMICRY

  33. KING SNAKE

  34. CORAL SNAKE

  35. WHICH IS WHICH? CORAL KING

  36. CRITICAL THINKING • WHAT MAKES AN IDEA A THEORY? • HOW IS A THEORY DIFFERENT FROM A FACT? • UPON WHAT FACTS DID DARWIN BASE HIS THEORY OF EVOLUTION?

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