The importance of phenotypic variation in louse body color is that it determines how the population will evolve.
It should be noted that a phenotypic variation simply means the variability in phenotypes that exists in a population.
Here, the importance of phenotypic variation in louse body color is that it determines how the population will evolve.
The decision of the researchers to hold lighting conditions constant in their experiment is justified to easily spot the louse.
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