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Introducing Evolution

Introducing Evolution. Objectives: SOL BIO.8a-d. TSW investigate and understand how populations change through time, including: Examining fossil records. Fossils. Any evidence of an organism that lived long ago. Types of Fossils. Cast Mold Trace fossils Imprints Petrified fossils

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Introducing Evolution

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  1. Introducing Evolution

  2. Objectives: SOL BIO.8a-d • TSW investigate and understand how populations change through time, including: • Examining fossil records

  3. Fossils • Any evidence of an organism that lived long ago.

  4. Types of Fossils • Cast • Mold • Trace fossils • Imprints • Petrified fossils • Frozen or Amber

  5. Dating Fossils • Relative Dating • Rock layers are put down in order • Oldest on bottom, youngest layers on top • Radiometric Dating • Carbon-14 (50,000 years or less) • Potassium-40 (1.3 billion years – 50,000 years)

  6. Why Use Fossils? • Scientists have used the fossil record to construct a history of life on Earth. • Earth’s life forms appeared 3.5 billion years ago • Fossil record is not complete, but pretty good for general information

  7. The Origin of Life on Earth • Abiogenesis – life from non-living things • Disproven by Redi and Pasteur • Primordial Soup – natural processes formed early organic compounds • Miller-Urey experiment • Bubble Theory – formed protocells • Stanley Fox

  8. Redi & Pasteur

  9. The Origin of Cells • Prokaryotes – Archaebacteria (1st cells) • Eukaryotes – endosymbiont hypothesis • Separate DNA in chloroplasts and mitochondria • Both organelles the same size and shape of bacteria

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