Biology: The Dynamic Science (MindTap Course List)
Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 25, Problem 1ITD
Summary Introduction

To review:

Whether the decline in the asteroid impact or the rise in atmospheric levels of oxygen took place first.

Introduction:

Earth was formed around 4.6 billion years ago. The first life form evolved around 3 billion years ago. It was a primitive life form and continued like that for around 2 billion years. The humans first evolved around 315,000 years ago.

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