A mass extinction is a period when very many species died out at once. Survive a mass extinction.
There have been five in the fossil record, and the largest killed about nine tenths of sea life. A mass extinction clears the ground, which is why mammals only got their chance after one.
1nounmass extinctionA period when very many species died out at once.
“The mass extinction took about thirty thousand years, which is fast in geology.”
mass extinction is an event.
Practised in Dinosaurs & Prehistory