Mammals have a four-chambered heart. Cetaceans have a 4-chambered heart, lungs to breathe, giving birth to young ones, mammary glands, endothermic, etc. Start your trial now! What is present on the feet of birds which provides more evidence for their evolution from reptiles and dinosaurs? 6.21) are some of the deepest diving organisms on the planet. Curator, Marine Mammals, National Museum of Natural History, Smithsonian Institution, Washington D.C. Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. land-dwelling mammals Use the evolutionary tree from the video to determine whether the following statements are true or false. You can see convergence in very different animals that live in similar habitats or have similar lifestyles. Evidence Organizer - DocsLib Mammals are a diverse group of vertebrate animals that includes between 5,000 and 5,500 species. (B) Flipper forelimb appendages on a humpback whale, Image courtesy of Amy Kennedy, National Oceanic and Atmospheric Administration (NOAA), Fig. 6.3 C). Pinnipeds offsite link are in the suborder pinnipedia . Evidence Organizer.docx - Cetaceans Evidence Organizer - Course Hero Use Advanced Search to search by activities, standards, and more. While this is not a problem at depth, when the animal returns to the surface, they must off-gas, or breathe out the gas they have absorbed in their tissue. The number of teeth varies among toothed whales, from two in the beaked whales (family Ziphiidae [Hyperoodontidae in some classifications]) to 242 in the La Plata river dolphin (Pontoporia blainvillei), to allow efficient capture of prey. Baleen whales (suborder Mysticeti), on the other hand, have lost all teeth in both jaws and instead have two rows of baleen plates in their upper jaws only. Most cetaceans do not have a cecum or appendix, and in most there is no anatomic difference between the small and the large intestine. Unlike fish, which swim by moving their heads from side-to-side to swing their tail, cetaceans propel themselves by moving their tail in a smooth, up-and-down motion. Whales and dolphins have long been known to possess an acute sense of hearing. We invite you to share your thoughts, ask for help or read what other educators have to say by. B. a dorsal hollow nerve cord, a notochord, bilateral symmetry, and mammary glands. 6.18. Both cetaceans and sirenians are well adapted to swimming through millions of years of evolution by natural selection. During deep dives, where anaerobic respiration is common, many marine mammals have adaptations that aid in lactic acid tolerance.

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