The two assertions are related in the following way: Every dolphin is an animal, and every dolphin has a fin. Aggregation : Inheritance
Typically, the dolphin's body contains five fins (some dolphins have only a small dorsal ridge while others, such as the "killer whale" have a very large dorsal fin). The dorsal fin, which is found on the animal's top (dorsal side), is loaded with fibrous connective tissue. It avoids "roll" and serves to keep the animal upright (much like a ship's keel). Additionally, it has a function for thermoregulation, which regulates body temperature. The dolphin must keep its body temperature between 97 and 99 degrees Fahrenheit since it has warm blood. The dorsal fin is used to expel extra body heat to the environment if the animal becomes overheated.
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