The greatest mass extinction of all time, resulting in the disappearance of 96% of all species, occurred roughly ______ million years ago.

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The greatest mass extinction of all time, also known as the Permian-Triassic extinction event, occurred approximately 252 million years ago. This event was caused by several factors, such as volcanic activity, climate change, and a decrease in oxygen levels in the ocean. The extinction of 96% of all species had a major impact on the evolution of life on Earth, paving the way for the rise of dinosaurs and mammals.

The Greatest Mass Extinction of All Time, Resulting in the Disappearance