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Passage:
The Cambrian Explosion, occurring approximately 541 million years ago, was a pivotal event in Earth’s history, marked by an unprecedented diversification of life forms. Prior to this period, most organisms were simple and microscopic. However, during the Cambrian, complex multicellular life, including arthropods and early vertebrates, rapidly emerged. Scientists attribute this phenomenon to multiple factors, including rising oxygen levels, genetic advancements, and ecological competition. Fossil evidence, such as those from the Burgess Shale in Canada, provides insight into the remarkable biological diversity of this era. Despite extensive research, the precise mechanisms driving this explosion of life remain a topic of scientific debate.
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1.
What is the Cambrian Explosion primarily known for?
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2.
What factor is not mentioned as a possible cause of the Cambrian Explosion?
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3.
Where have important fossil records of the Cambrian period been found?
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4.
What does the passage suggest about the scientific consensus on the Cambrian Explosion?
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5.
Which of the following best describes the nature of life before the Cambrian period?
