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A researcher is studying a species of tree that has thorns. She is able to compare the length of thorns on currently living trees to those on trees that lived 100 years ago. She finds that the thorns on trees from 100 years ago ranged in length from 1.5-3.3 cm, but the thorns on trees today range in length from 1.8-4.6 cm. Which of the following is the most likely explanation for the expanded range in size of the thorns?
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