Since Darwin published on the Origins of Species, scientists have pursued different areas of research to test his theory of natural
selection. Researchers have found that different penguin species
have similar DNA sequences, also called
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which supports
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Darwin's ideas about a common ancestor. Other scientists have
compared the structures of the wings of penguins to the structures
of the wings of other species of birds, such as seagulls. The wings
of penguins and the wings of seagulls are
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because they are
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similar in structure and derived from a common ancestor but have
evolved to fulfill different purposes. The penguin's wings are also an
example of Choose...
because
penguins can no longer use them to fly. Scientists studying
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have hypothesized that
the Galapagos penguin evolved from Humboldt penguins that were
carried from Chile and Peru by ocean currents.