Principles of Biology
Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 22, Problem 8TY
Summary Introduction

Introduction:

Evolution of the earth was happened through number of eras; billions of years ago. Significant changes were observed through each and every era. Plants, animals and all the living organisms evolved throughout the evolution and evolution is a continuous process which never last. An era refers to indicate a long period of time which is marked by the beginning and end of a significant event. A period refers to a large interval of time with a definite characteristics and period is a subdivided area which comes under era.

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