The population of brown rabbits increase because the predators can't see them due to colour of the soil.
The population of brown fur rabbits have increased to 80% of the population as compared to white rabbits because brown rabbits can't be seen by the predators in the desert whereas the white rabbits are easily seen by the predators so the population of the brown rabbits increases.
So we can conclude that the population of brown rabbits increase because the predators can't see them due to colour of the soil.
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