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प्रश्न
What is mass extinction? Will you encounter one such extinction in the near future. Enumerate the steps to be taken to prevent it.
टीपा लिहा
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उत्तर
The Earth has experienced quite a few mass extinctions due to environmental catastrophes. A mass extinction occurred about 225 million years ago during the Permian, where 90% of shallow water marine invertebrates disappeared.
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