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Concept explainers
To List:The given events in the order in which they occurred from first to last.
- Earliest human
- Earliest animals
- Earliest mammals
- First life on earth
- Earliest plants living on land
- First time there is significant oxygen in Earth's atmosphere
- Impact causes extinction of dinosaurs.
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Explanation of Solution
Introduction:
The Earth was formed nearly 4.5 billionyears ago from the solar system. All the swirling gases and dust were pulled by gravity to form the earth.
Before 2.4 billion years ago the oxygenstarted to appear initially. After the significant oxygen formation in earth's atmosphere, first life of the earth was appeared.Thenearliest plant living on the land took came into existence. Around 200 million years ago,earliest mammals and dinosaurs appeared. Then dinosaurs mass extinction took place. Then earliest human appeared.
Conclusion:
Thus, the correct sequence is,
- First time there is significant oxygen in Earth's atmosphere.
- First life on earth
- Earliest plants living on land.
- Earliest animals.
- Earliest mammals.
- Impact causes extinction of dinosaurs.
- Earliest human.
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Chapter 19 Solutions
Modified Mastering Astronomy with Pearson eText -- Combo Access Card -- for Essential Cosmic Perspective-- 18 months
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