Ichthyosaurs are ancient extinct marine reptiles. Fossils show us that they had dorsal fins and tails just as fish do, even though their closest extant relatives were terrestrial reptiles that had neither dorsal fins nor aquatic tails. The dorsal fins and tails of ichthyosaurs and fish are: a. homologous and adaptations to a common environment. b. adaptations to a common environment. c. examples of convergent evolution. d. examples of convergent evolution and adaptations to a common environment.
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