At the end of the Permian period a large mass extinction occurred; 90-95% of the marine and terrestrial species were eliminated. Which of the following are thought to be the possible cause(s) of this mass extinction? Select all that apply.

_____ Glaciation.
_____ Volcanic eruptions.
_____ Meteorite collisions with Earth.
_____ Competition between marine and terrestrial species.
_____ Sudden drop in atmospheric O2.


__X__ Glaciation.
__X__ Volcanic eruptions.
_____ Meteorite collisions with Earth.
_____ Competition between marine and terrestrial species.
_____ Sudden drop in atmospheric O2.

Biology & Microbiology

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Fill in the blank(s) with the appropriate word(s).

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