What is meant by the term speciation? List four factors which could lead to speciation. -Biology

What is meant by the term speciation? List four factors which could lead to speciation. -Biology
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Speciation is the evolution of reproductive isolation among once interbreeding population. Factors which can lead to speciation are:Genetic drift: Over generations, genetic drift may accumulate which leads to speciation.Natural selection: Natural selection may work differently in different location which may give rise to speciation. Severe DNA change.A variation may occur which does not allow sexual act between two groups.
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