This species of rabbit lives together in a cold environment and the genetic variation in the species is the color of their fur.  
The rabbit's enviroment broke into two glaciers and they started to float away from each other. Each glacier has brown and white rabbits on it. 
These two populations of rabbits are no longer the same species because of geographical isolation.  Because of the different environments they live in, they had genetic changes that helped them survive in their specific environments. If brought back together, the species could not interbreed because the species need opposite environments in order to reproduce. 
One glacier floats to a cold and woods like environment, covered in snow year round. The white rabbits blend in with the snow and the brown rabbits stick out in this type of enviroment, making them more noticeable to predators. 
The other glacier floats to a warm and woods like environment where it does not snow and is warm year round. The brown rabbits blend in with the enviroment and the white rabbits stick out in this type of enviroment, making them more noticeable to predators. 
Over time, the species of rabbits develops into only white rabbits since they can blend in with the environment and are harder to spot by predators. Also, they adapt to the cold environment by the population evolving with ticker fur and require a cold, snowy environment to reproduce and live comfortably. 
In the other inviroment, the species of rabbits develop into only brown rabbits overtime because of the color of their fur, they can easily blend into the environment and are harder to spot by preditors. Also, they adapt to the warm environment by the population evolving with thin fur and require a warm environment to reproduce and live comfortbly. 
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