Question

Why is 'Permian-Triassic' extinction event, called the 'Mother of all Extinctions'?

Answer 1

Answer:

The event forms the boundary between the Permian and Triassic periods, at about 252 million years ago. Because so much biodiversity was lost, the recovery of life on earth took much longer than after other extinction events. This event has been described as the "mother of all mass extinctions".

Answer 2

The Permian/Triassic extinction event (P/Tr for short) was the largest extinction event in the Phanerozoic eon. 96% of all marine species and 70% of terrestrial vertebrates became extinct. It is the only known extinction event of insects. It ended the Palaeozoic era, and began the Mesozoic era.

The event forms the boundary between the Permian and Triassic periods, at about 252 million years ago.[1][2][3][4] Because so much biodiversity was lost, the recovery of life on earth took much longer than after other extinction events.[3] This event has been described as the "mother of all mass extinctions".[5] The pattern of extinction is still unclear,[6] as different studies suggest one to three different pulses.