![KT impact](https://news.st-andrews.ac.uk/wp-content/uploads/2019/10/KT-impact-new-e1571660916784-360x240-c.jpg)
Acidic oceans
New international study confirms a long-held theory about the last great mass extinction event and the evolution of marine life.
New international study confirms a long-held theory about the last great mass extinction event and the evolution of marine life.