The textbook describes a study showing that London taxicab drivers' constant exposure to GPS devices correlated with hippocampus shrinkage over time. This best exemplifies:

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The study's findings suggest an epigenetic change, where the environment (constant exposure to GPS devices) influences physical changes in the brain (hippocampus shrinkage), without altering the DNA sequence. This is an example of how environmental factors can lead to biological changes.

The Textbook Describes a Study Showing That London Taxicab Drivers