Natural selection hasn't removed one of these phenotypes yet because the frequency of each phenotype affects how dynamically the two phenotypes are kept in balance.
The process through which populations of living things adapt and change is known as natural selection.
A population's members are naturally varied, which means that they are all distinctive in some ways.
This variety indicates that some people have characteristics that are more environment-appropriate than others.
Since this is how an organism interacts with its environment, natural selection focuses on its phenotype.
The scale-eating fish in Africa exist as two different phenotypes, "right-mouthed" and "left-mouthed. Because the frequency of each trait determines how dynamically the two phenotypes are maintained in balance, natural selection has not yet eliminated one of these phenotypes.
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