Which of the following eras in Earth's history is the longest? Precambrian Cenozoic Paleozoic Cambrian O Mesozoic

Human Anatomy & Physiology (11th Edition)
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Chapter1: The Human Body: An Orientation
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**Question:**

Which of the following eras in Earth's history is the longest?

- O Precambrian
- O Cenozoic
- O Paleozoic
- O Cambrian
- O Mesozoic

**Explanation:**

This question asks about the duration of different eras in Earth's history. The options listed are major divisions of geological time:

- **Precambrian**: The earliest part of Earth's history, covering approximately 88% of geological time, making it the longest era.
- **Cenozoic**: The current era, beginning around 66 million years ago.
- **Paleozoic**: An era following the Precambrian, lasting about 291 million years.
- **Cambrian**: A period within the Paleozoic Era, known for the "Cambrian Explosion" of life.
- **Mesozoic**: The era between the Paleozoic and Cenozoic, known as the "Age of Reptiles" or "Age of Dinosaurs."

*Note: There are no graphs or diagrams associated with this question.*
Transcribed Image Text:**Question:** Which of the following eras in Earth's history is the longest? - O Precambrian - O Cenozoic - O Paleozoic - O Cambrian - O Mesozoic **Explanation:** This question asks about the duration of different eras in Earth's history. The options listed are major divisions of geological time: - **Precambrian**: The earliest part of Earth's history, covering approximately 88% of geological time, making it the longest era. - **Cenozoic**: The current era, beginning around 66 million years ago. - **Paleozoic**: An era following the Precambrian, lasting about 291 million years. - **Cambrian**: A period within the Paleozoic Era, known for the "Cambrian Explosion" of life. - **Mesozoic**: The era between the Paleozoic and Cenozoic, known as the "Age of Reptiles" or "Age of Dinosaurs." *Note: There are no graphs or diagrams associated with this question.*
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