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During the ordovician period, it is believed that the sea levels dropped due to the movement of the continents. this event led to the extinction of over 50 percent of all life on earth. this event occurred about a) 5 billion years ago. b) 475 million years ago. c) 450 thousand years ago. eliminate d) 500 million years ago.
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During the ordovician period, it is believed that the sea levels dropped due to the movement of the...
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