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Fig. 26-7. Divergent and convergent evolution can be illustrated by a study of the anterior appendages of three 

 different groups of vertebrates. The ancestral reptile appendages diverged for locomotion (walking and flying) at 

 a very early time. Some members of each class (reptiles, birds, mammals) subsequently underwent convergence 

 toward flight and life in the water by modifying their anterior appendages to function more effecively in these 

 environments. 



