The mass extinction event that occurred about 542 million years ago is known as the Great Ordovician Extinction. However, this event marks the beginning of the Cambrian Period, which is notable for a significant increase in the diversity of life forms.

Here's the breakdown of the options:

1. **A. Cambrian Period**: This is the correct answer. The Cambrian Period is recognized for the "Cambrian Explosion," a time when numerous species of animals appeared in a relatively short geological timeframe.

2. **B. Hadean Period**: This period predates the establishment of Earth as we know it and is characterized by the formation of the planet and its initial crust. It ended approximately 4 billion years ago.

3. **C. Permian Period**: This period occurred much later, about 299 to 252 million years ago, and is known for the Permian-Triassic extinction event, the Earth's largest known mass extinction event.

### Final Answer
A. Cambrian Period

Question

The mass extinction event that occurred about 542 million years ago is known as the Great Ordovician Extinction. However, this event marks the beginning of the Cambrian Period, which is notable for a significant increase in the diversity of life forms.

Here's the breakdown of the options:

1. **A. Cambrian Period**: This is the correct answer. The Cambrian Period is recognized for the "Cambrian Explosion," a time when numerous species of animals appeared in a relatively short geological timeframe.

2. **B. Hadean Period**: This period predates the establishment of Earth as we know it and is characterized by the formation of the planet and its initial crust. It ended approximately 4 billion years ago.

3. **C. Permian Period**: This period occurred much later, about 299 to 252 million years ago, and is known for the Permian-Triassic extinction event, the Earth's largest known mass extinction event.

### Final Answer
A. Cambrian Period

Knowee AI · Accepted Answer

The mass extinction event that occurred about 542 million years ago is known as the Great Ordovician Extinction. However, this event marks the beginning of the Cambrian Period, which is notable for a significant increase in the diversity of life forms.

Here's the breakdown of the options:

1. **A. Cambrian Period**: This is the correct answer. The Cambrian Period is recognized for the "Cambrian Explosion," a time when numerous species of animals appeared in a relatively short geological timeframe.

2. **B. Hadean Period**: This period predates the establishment of Earth as we know it and is characterized by the formation of the planet and its initial crust. It ended approximately 4 billion years ago.

3. **C. Permian Period**: This period occurred much later, about 299 to 252 million years ago, and is known for the Permian-Triassic extinction event, the Earth's largest known mass extinction event.

### Final Answer
A. Cambrian Period

A mass extinction event occurred about 542 mya that marks the boundary between Precambrian time and the A. Cambrian Period B. Hadean Period C. Permian Period

Question

A mass extinction event occurred about 542 mya that marks the boundary between Precambrian time and the

Solution

Final Answer

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