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Evolution 101

Understanding homology and convergent evolution

The Tree Room

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A close-up photograph shows a man leaning over the edge of a small boat, looking at a large Atlantic cod just below the water's surface. The fish is greenish-brown and is being held next to the boat by the man's hand. The surrounding water is a dark, deep blue, and in the background are rolling hills and mountains under a bright sky. The image suggests a fishing expedition in a cold, northern environment.

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