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

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Presentation transcript:

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 Frozen or Amber

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)

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

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

Redi & Pasteur

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