Chapter 22, Problem 7AWK

Summary Introduction

To review

The causes of extinction and if humans are one of them.

Introduction:

Extinction means that a life-form dies out completely. Throughout the evolutionary history of the earth, major catastrophic events have sometimes wiped out whole groups of species regardless of fitness. Climate changes, volcanic activity, the actions of oxygen-producing organisms, changes in carbon dioxide concentration, asteroid impacts, have all lead to the extinction of species.