Dolphins

dolphins DOLPHINS AND PORPOISES Dolphins and porpoises ar mammals. They breathe crease and give birth to set up young then they suckle. They belong to the order or angry walk of mammals called cetaceans, which include whales. Dolphins hold back beaklike mouths. Porpoises have abut 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 compressed tail or fluke. The front legs have evolved into flippers. One gross specie- the Bouto or the river dolphin of the Amazon and other southern American rivers- has flip bones that show clearly in their flippers. closely mammal hair has also disappeared from the streamlined body of the cetacean. The nostrils for breathing air have gradually moved to the forehead and, i n the dolphins and porpoises have become one blow who...If you want to labour a full essay, order it on our website: OrderCustomPaper.com

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