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Home Q & A Board Humanities History Anthropology
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missmaggoo missmaggoo
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Posts: 1032
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6 years ago
Of the mass extinction events occurring in the past 570 million years, _________of them altered all of the earth's ecosystems.
 
  a. one
  b. two
  c. four
  d. none
  e. three
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LuisDantasLuisDantas
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#1
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6 years ago
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missmaggoo Author
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6 years ago
Thank you, thank you, thank you!
oscar520000
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Yesterday
You make an excellent tutor!
julymontalvo
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2 hours ago
this is exactly what I needed
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