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Physics, 19.01.2017 19:17 slrich21

When geologists refer to the "big five," what are they referring to?
the five most important organisms that have become extinct.
the five largest mass extinctions in earth's history.
the five most influential events that have changed the surface of the earth.
the five most important inventions that have allowed scientists to study mass extinctions.

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When geologists refer to the "big five," what are they referring to?
the five most important...
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