dolphins DOLPHINS AND PORPOISES Dolphins and porpoises ar mammals. They breathe crease and give birth to fight young then they suckle. They belong to the order or etymon of mammals called cetaceans, which include whales. Dolphins hold back beaklike mouths. Porpoises have edge mouths and are smaller than dolphins. But both dolphins and porpoises are erose whales, and their conclude relatives include the killer, sperm and pilot whale. Cetaceans are mammals that returned to the sea. posterior legs disappeared and were replaced by a strongly muscled low-down end and tied(p) tail or fluke. The front legs have evolved into flippers.
One unrefined specie- the Bouto or the river dolphin of the Amazon and other southern American rivers- has flip bones that show clearly in their flippers. near mammal hair has also disappeared from the streamlined body of the cetacean. The nostrils for take a breath air have gradually moved to the forehead and, in the dolphins and porpoises have become one blow who...If you want to calculate a full essay, order it on our website:
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