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More bear offspring are produced than will survive.
Some bears have long fur, while others have short fur.
The bears live on snowy mountains in caves.
Cold temperatures threaten the bears' survival.
The bears with longer fur are being selected for because they are protected from the cold, while the bears with shorter fur are more likely to freeze and therefore being selected against.
Over time, more of the bear offspring will have long fur because those with longer fur are more likely to survive and reproduce.
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