Question

Which time period saw the loss of 96% of all marine species and 70% of all terrestrial species?

Answer 1

Answer: the Permian–Triassic extinction event ; {"end of the Permian era"} .
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Answer 2

Permian-Triassic mass extinction

Step-by-step explanation:

• The Permian-Triassic extinction event, occurred at about 252 MYA. This period marks the boundary between the Permian and Triassic periods.
• It is the most severe extinction event that took place on earth, with up to 96% of all marine species and 70% of terrestrial vertebrate species becoming extinct.
• Due to such a great biodiversity loss, the recovery of life on Earth took a longer time than other extinction events.