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A population of birds has some red birds and some brown birds. This difference in color from one bird to another is called a(n)
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. The red birds are eaten more often by predators because they are easier to see, but the brown birds blend in with their environment and are not eaten as often. The brown color in these birds is called a(n)
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. 100 years ago, most of the birds in the population were red. After many generations have died and reproduced, today, most of the birds in the population are brown. This process is called
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