An overview of the evolution of dolphins and whales.
Written in 2004; 2,055 words; 6 sources; APA; $ 64.95
Paper Summary:
This essay begins by discussing the features of two marine mammals - dolphins and whale. The writer researches the behavior, lifestyle and evolution of these mammals, comparing them to other fish that live in the ocean and also other land mammals.
From the Paper:
"Cetaceans are unique marine mammals that depend solely on the ocean for their life needs. There are seventy-four extant species in this order. The species are split into two categories: toothed and baleen. Baleen cetaceans are all large whales, and toothed cetaceans include large and small whales, porpoises, and dolphins. Almost all species live in the world's oceans, but a few dolphins live in freshwater environments. Cetaceans are extraordinary in that they were once land animals who evolved features that allowed them to move back into the water to live. However, they are warm-blooded and nurse their young with milk (Scheffer, 1976)."
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