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Causes and Evidence of Evolution

Causes and Evidence of Evolution. Objective 3.05: Evidence of the theory of evolution. Causes of Evolution. Natural Selection Mutations Competition Geographic Isolation. Example of Geographic Isolation. Beetle population divided by a river.

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Causes and Evidence of Evolution

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  1. Causes and Evidence of Evolution Objective 3.05: Evidence of the theory of evolution

  2. Causes of Evolution • Natural Selection • Mutations • Competition • Geographic Isolation

  3. Example of Geographic Isolation • Beetle population divided by a river. • Both groups of beetles become different because they adapt to their new (different) environments. • Even if reunited, they would not mate with each other again because they have evolved genetically and behaviorally into two different species (speciation)!

  4. 5 Pieces of Evidence • Anatomy • Embryo Comparison • Biochemical (DNA) • Adaptations • Fossils

  5. Adaptations • Inherited traits that aid in survival • Mimicry: Acts like another organism or pretends to be a harmful predator. • Camouflage: Blends in for better survival • Antibiotic/Pesticide Resistance: Some bacteria do not respond to drugs which means they are able to survive and multiply!

  6. Antibiotic Resistance • Normal H. pylori bacteria produces an enzyme that activates an antibiotic. • That mixture creates a “poison” to the bacteria and kills it. • The bacteria mutates to not produce the enzyme.

  7. Fossils • Evidence of once living organisms. • Can be: • Bones • Footprints • Imprints • Fossil Record: The history of life on Earth as shown by fossils preserved in rocks. • Shows: • How species changed over time • If any species go extinct • The Geologic Time Scale is based on the Fossil Record.

  8. Fossils of the Geologic Time Scale

  9. Age of Fossils • Relative Age:One fossil is older/younger than another based on rock layers. • Does not tell exact age.

  10. Age of Fossils • Absolute Age: The more exact age of a fossil. • Based on decay of organisms (Carbon Dating) • Use half life to determine age • Half Life: Time it takes for half the atoms to decay.

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