Chapter 22, Problem 9TY

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. Hominoids were the recent ancestors of humans, chimpanzees, gorillas, orangutans and gibbons. Hominins were a subset of hominoids which includes modern humans, extinct human species and the immediate ancestors of the modern humans.