Question

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

Answer 1

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

Answer 2

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.