A mass extinction occurs when at least 75 per cent of species are destroyed. File photo: Nasa
A mass extinction occurs when at least 75 per cent of species are destroyed. File photo: Nasa
Science

The first mass extinction event was from a lack of oxygen, researchers say

  • First mass extinction occurred 550 million years ago, because of a drop in the amount of oxygen in waterways
  • The Earth has had five mass extinction events, and scientists hope research can help avoid a sixth

A mass extinction occurs when at least 75 per cent of species are destroyed. File photo: Nasa
A mass extinction occurs when at least 75 per cent of species are destroyed. File photo: Nasa
READ FULL ARTICLE