One type of dog has fur that suits his niche and the other one does not.
Fur of the dogs
There where two different types of fur for dogs that live in the savanna. One was better suited to it's niche.
The black furred dog could easily be seen by other predators and the brown one could hide and not be seen by other predators.
Because the black furred dogs got hunted more, they died off. The brown furred dogs increased while the black ones decrease.
Over time the population changed because the black furred dogs died of and the brown furred dogs survived to reproduce and thus, the population changed as a whole and the not individual.
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