Which of the following is an example of selective breeding?
A rancher breeds average sized cattle with larger cattle. The offspring weighs more and provides more meat.
A farmer found that if the temperature of the barn is kept five degrees warmer, the cows in the barn produce more milk.
A gardener plants corn seeds in the field two weeks earlier than usual. The earlier start yields more corn.
An ecologist observes that tan mice are more visible to predatory birds than black mice.
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