Definition : Evolution means Change in time in biology, this means, “Change in biological entities in time”
Introduction : Evolution is the process of continuous changes and involves the trends like increased adaptations, the complexity of structures and functional efficiency. Evolution involves the changes, in flora and fauna that have occurred once millions of years on earth.
Herbert Spencer coined the term evolution. This was called “Organic Evolution” by Charles Darwin similarly, the matter also changes with time and is called inorganic evolution.
In order to determine whether or not life has changed over time, what we have to do is to identify what has occurred in the past viz. how the earth was formed ? or what steps led to an evolution of living cells and solar system.
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Many assumptions made to understand the formation of the universe and henceforth life the most popular and accepted theory was Big Bang Theory.