Which of the following defines the permian-triassic? a the mass extinction that could occur if an asteroid were to hit the earth. b a catastrophic event where 90 percent of the ocean's species were lost and 70 percent of the land life was thought to go extinct. c the effects of repeated neos entering our solar system d the great dying that is said to have completely destroyed all life, making it a mass extinction

Option b, A catastrophic event where 90 percent of the ocean's species were lost and 70 percent of the land life was thought to go extinct.

Explanation:

In the Permian period large mass extinction of the Earth took place. This incident took place some 299 years ago.

The super continent Pangaea was emerging during the Permian period which caused severe extremes of climate and environment as it was extremely large in size. Much of the region was under ice caps and was frozen.

Nearly 90 percent of all marine species and 70 percent of all land animals became extinct.

Hence , option A is correct

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