Introduction

Organic evolution refers to the slow and gradual process by which living organisms have changed from the simplest unicellular form to the most complex multi-cellular forms that are existing today. Organic evolution primarily involves modifications in the existing organisms and the inheritance of these modifications.Biological evolution is genetic change in a population from one generation to another.  The speed and direction of change is variable with different species lines and at different times.  Continuous evolution over many generations can result in the development of new varieties and species.  Likewise, failure to evolve in response to environmental changes can, and often does, lead to extinction.

Adaptation is defined as the possession of special features or structure which improves the chances of an organism to survive in its environment. In other words, adaptation is a change in an organism that makes it to adjust or survive in its environment. The survival requires measures in terms of structure, reproduction, and other processes developed by the organism in other to withstand the hazard (or danger) and biological changes that exist in the environment. This is called adaptive features…

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