Pine trees become temporarily sterile when exposed to ultraviolet radiation as intense as some scientists believe Earth experienced 252 million years ago during the planet’s largest mass extinction, lending support to the theory that ozone depletion contributed to the crisis.
At the end of the Permian 252 million years ago, the continents were part of one supercontinent
called Gondwana. Fossils from many areas of Gondwana contain…
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