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You can see from the two bar graphs that different populations of Acer rubrum from different latitudes have different leaf traits. This indicates that the different populations have adapted to their respective environments over time and therefore have different genotypes.

You can see from the two bar graphs that different populations of Acer rubrum from different latitudes have different leaf traits. This indicates that the different populations have adapted to their respective environments over time and therefore have different genotypes.
One environmental factor that a population of trees would adapt to is climate, including average temperatures. In fact, the "toothiness" of leaf fossils of known age has been used by paleoclimatologists to estimate past temperatures in a region.
If a 10,000-year-old fossilized Acer rubrum leaf from South Carolina had an average of 4.2 teeth per square centimeter of leaf area, what could you infer about the relative temperature of South Carolina 10,000 years ago compared with today? Use Figure 2 to help you answer this question.

The answer is :

South Carolina was much colder 10,000 years ago than it is today.
4.2 teeth per cm2 of leaf area is similar to the number of teeth in leaves of living trees from Ontario, Canada, where the present climate is much colder than in South Carolina.

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