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Evidence in the fossil record points to
major asteroid impacts that have caused mass extinctions in which 50%–96% of life on Earth died out

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The Permian-Triassic extinction event about 250 million years ago was the deadliest: More than 90 percent of all species perished. Many scientists believe an asteroid or comet triggered the massive die-off, but, again, no crater has been found. Another strong contender is flood volcanism from the Siberian Traps, a large igneous province in Russia. Impact-triggered volcanism is yet another possibility.

Evidence in the fossil record points to  (________)major asteroid impacts that have caused mass extinctions in which 50%–96% of life on Earth died out


It is 5.

Points to __5___ major asteroid impacts

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