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Madam Madam
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6 years ago

The PaleozoicMesozoic boundary is a major break in the geologic time scale because
  a. it is marked by a mass extinction event.
  b. it is marked by an explosion in the quantity and diversity of life.
  c. it is when reptiles first appeared.
  d. it is when mammals first appeared.
  e. it is a time of great volcanic activity.
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dkeysdaniedkeysdanie
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