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5th Grade Ch. 6 Lesson 3 How do Changes Cause More Changes


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5th Grade Ch. 6 Lesson 3 How do Changes Cause More Changes

  1. 1. Ch. 6 Lesson 3 How do changes cause more changes?
  2. 2. pesticide <ul><li>poison that kills insects </li></ul>
  3. 3. Mosquitoes spread diseases- malaria & West Nile virus
  4. 4. Some mosquitoes develop adaptations to survive pesticides. They inherited genes that allow them to survive around the pesticide.
  5. 5. antibiotics <ul><li>medicines used to kill disease-causing bacteria </li></ul>
  6. 7. Some bacteria develop adaptations to survive antibiotics- makes diseases harder to treat.
  7. 8. extinct <ul><li>species where no members of its kind are alive </li></ul>dodo bird
  8. 12. fossils <ul><li>sources of evidence of past extinctions of plants & animals </li></ul>
  9. 13. bald eagle <ul><li>pesticides (DDT) washed into rivers & streams </li></ul><ul><li>fish - DDT </li></ul><ul><li>eagle ate fish </li></ul><ul><li>caused birds to lay thin shelled eggs </li></ul><ul><li>1972-DDT banned </li></ul><ul><li>population began to recover </li></ul>
  10. 14. DDT <ul><li>dichlorodiphenyltrichloroethane </li></ul>
  11. 17. DDT makes birds’ shells thin
  12. 18. Bald eagles could not adapt to pesticide. Bald Eagle Web Cam