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Genetic Variation : in this situation there are two kind of fishes . Bright and Dull , their survival depend on there genetics to blend in with the water or surrounding.
overproduction & struggle for existence: due to overproduction it was difficult for the babies to get enough food so some died from not having nutrients.
Differential survival & reproduction : The dull fish having a positive outcome unlike the brighter fish because they can't blind in such as the gray fish can therefore they can reproduce more.
changes in gene pool : The gene pool changes because of the brighter fish getting eaten and due of lack of food.
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