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Since the enviornment is snowy the white fur allele dominates the brown fur allele, resulting in more white bears than brown.
As the snow melts due to global warming, the brown fur allele becomes more favoriable and more brown bears are born causing the bear population to even with brown fur to white fur
Now that the snow is almost completely melted the brown fur allele is passed on more than the white bear allele and the white bear allele gets outnumbered.
SInce the snow is completely melted the brown fur allele several outnumbers the white fur, and the white fur numbers plummet.
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