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Cetacea
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=== Circulation === Cetaceans have powerful hearts. Blood oxygen is distributed effectively throughout the body. They are warm-blooded, i.e., they hold a nearly constant body temperature.<ref>{{cite web |title=Whales, dolphins and porpoises |url=https://www.dcceew.gov.au/environment/marine/marine-species/cetaceans |website=Department of Climate Change, Energy, the Environment and Water |publisher=Australian Government Department of Climate Change, Energy, the Environment and Water |access-date=19 October 2024}}</ref>
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