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Home Q & A Board Science-Related Homework Help Geography and Earth Sciences
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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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6 years ago
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Madam Author
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6 years ago
Just got PERFECT on my quiz
GeorgeNeist
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Helped a lot
deathDoUsPart
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2 hours ago
I appreciate what you did here, answered it right Smiling Face with Open Mouth
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