What event occurred at the close of the precambrian era?

What event occurred at the close of the precambrian era?

Correct Answer: a mass extinction
natural selection
spontaneous mutation
ecosystem succession

Explanation: At the close of the Precambrian 544 million years ago, a mass extinction occurred. In a mass extinction , many or even most species abruptly disappear from Earth. There have been five mass extinctions in Earth’s history. Many scientists think we are currently going through a sixth mass extinction.

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