I believe it is behavioural isolation. When there are changes within a certain species, e.g. new birdcalls are formed in certain individuals in a species, "traditional" birds may not like such mating calls and only choose to mate with the more common birdcalls from majority of the birds. There are also some birds that may like the new birdcalls, and choose to mate with birds with those birdcalls. They become genetically isolated as they continue such behavior. Eventually, through genetic drift and other mutations, different species form from a single specie.
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The factor that would least likely to influence the rate of enzyme activity in cells is the number of Golgi complexes near the reaction site.
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<span>A woman who has completed one pregnancy with a fetus (or fetuses) reaching the stage of fetal viability is called Primipara</span>
pri·mip·a·ra<span>prīˈmipərə/</span>nounMedicine<span>noun: primipara</span><span>; plural noun: primiparae</span><span>a woman who is giving birth for the first time.
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