Terrestrial Mammals: A Comparative Essay

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Several lineages of terrestrial mammals evolved separately to live in marine environments. Although there are several different lineages of marine mammals; many did not originate their marine adaptations from a common ancestor. Different marine mammals do share similarities in morphology and show convergent evolution. The environment has shaped these species in similar ways. Through research, it is known that all mammals, marine or otherwise, share a common ancestor far back in their phylogenetic tree, but some are more closely related than others. These phylogenetic origins of marine mammals can be looked at to compare and contrast the similarities that they share because of a common ancestor and those similarities they share because of convergent
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