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Discuss the various adaptations of vertebrates that enable them to live in marine conditions. Vertebrates that live in water are said to be aquatic, and naturally over the course of time they have adapted to these marine conditions. They face a number of problems when it come to living in water, which I shall identify later, but have evolved complex and unique ways of dealing with them. Firstly though there must be a distinction between the types of aquatic vertebrates, although they can obviously be classified according to taxa it is more helpful to distinguish how they have adapted to a marine environment. All fishes are primary swimmers-their ancestors also swam. Other swimming vertebrates are secondary swimmers-their ancestors passed through a terrestrial state, and consequently they have structural and physiological handicaps that have prevented most of them from becoming entirely aquatic again. It is academic to ask about the survival value...

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