karamn218
Answered

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When did the first mass extinction happen?
• At the end of the Permian Period
•During the Cambrian Explosion
•In the middle of the Silurian Period
•Never

Sagot :

rubenchhatkuli

Answer: About 445 Million Years Ago

Explanation: The first mass extinction is called the Ordovician-Silurian Extinction. It occurred about 440 million years ago, at the end of the period that paleontologists and geologists call the Ordovician, and followed by the start of the Silurian period. In this extinction event, many small organisms of the sea became extinct.

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