Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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
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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