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The theory of evolution is based on the idea that allspecies are related and gradually change over time.

Evolution relies on there beinggenetic variation in a population which affects the physical characteristics (phenotype) of an organism.

Some of these characteristics may give the individual an advantage over other individuals which they can then pass on to their offspring.

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Study of the history of different life forms is called evolutionary biology.life form means different types of organism.

Or,

Evolutionary biology is the subfield of biology that studies the evolutionary processes (natural selection, common descent, speciation) that produced the diversity of life on Earth.