
On the surface, whales and fish share many things: use of aquatic environments, they are vertebrates and have morphological adaptions that facilitate locomotion in water. The latter is described in detail here: The repeated invasion of aquatic and marine environments by tetrapods over the last 250 million years has resulted in a host of convergent morphological adaptations that facilitate life in water (Kelley and Pyenson, 2015). Among these adaptations are the evolution of a fusiform body ...
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