Scientists May Have Solved Mystery of Earth's Largest Mass Extinction

Source: Science Daily - Top NewsWhy do beaches today have seashells from clams and snails instead of brachiopods? A new study suggests that the answer lies in Earth's greatest mass extinction, when warming oceans and falling oxygen levels wiped out animals that couldn't adapt. Species with body plans and metabolisms better suited to the changing conditions survived and went on to dominate the seas, offering a glimpse of how modern marine life could respond to climate change.