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You requested a trend report on Read Each Example And Decide Whether Each Would Increase Or Decrease The Genetic Variation In The Gene Pool Of That Population. A Zebra Migrates To Join A Different Herd Of Zebras. Competition For Sunlight Leads To Taller Trees. The Dna Of A Snake Changes To Make Its Venom Stronger. A Grassfire Randomly Sweeps Through A Population Of Buffalo And Kills Most Of The Animals.

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