Evidence for evolution

• What is a fossil?

  Evidence of an ancient animal or plant
• Where are fossils commonly found?

  In rocks
• What can fossils tell us about ancient organisms?

  About their appearance and size
• How can fossils be arranged to show evolutionary changes?

  In date order to see gradual changes
• What does the arrangement of fossils provide evidence for?

  Evolution and species diversification
• How can the fossilized forms of a horse help in understanding evolution?

  They suggest a family tree for modern horses
• What are antibiotics used for?

  To kill bacteria
• What does it mean for bacteria to be resistant to antibiotics?

  They are not killed by antibiotics
• How do bacteria become resistant to antibiotics?

  Through natural selection
• What do resistant bacteria possess that allows them to survive antibiotics?

  Genetic variants
• What happens to standard bacteria when treated with antibiotics?

  They may be killed by the treatment
• Why are resistant bacteria more likely to survive and reproduce?

  They are not killed by antibiotics
• What is the result of resistant bacteria reproducing?

  Genetic variants for resistance spread
• What does the spread of antibiotic resistance indicate?

  Change in inherited characteristics over time
• How does antibiotic resistance provide evidence for evolution?

  It shows change through natural selection
• How do fossils provide evidence for evolution?

  • Fossils show ancient life forms
  • They reveal changes over time
  • Fossils can be arranged by age
  • They illustrate species diversification
• What is the process of antibiotic resistance in bacteria?

  • Antibiotics kill susceptible bacteria
  • Resistant bacteria survive due to genetic variants
  • Resistant bacteria reproduce more successfully
  • Resistance traits spread through generations