Evolution cannot be equated with progress.\t\xa0Evolution is not exactly taking place from lower organisms to higher organisms but it can be related to the fact that higher and complex body forms evolved even when the low and simple forms are still existing. An individual also plays an important role in the evolutionary process. An individual contributes its specific genes into the gene pool of the population during transferring its genetic variations to its offspring.\t\xa0These variations are carried on to successive generations by natural selection.\t\xa0If these genetic variations get accumulated over a period of time, alter the individuals of the subgroup and later give rise to new species.
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