6.6. Cetaceans Are Mammals. 6.18 B). The mouth of one adult bowhead, or Greenland right whale (Balaena mysticetus), measures five metres long and three metres wide and is the biggest oral cavity on record. Cetaceans have developed horizontal flukes that increase the propulsion area driven by the back muscles. Circle the tree diagram that best shows the relationship between fish, cetaceans, and mammals. For this reason, veterinarians had to perfect respirators before dolphins could be successfully anesthetized. 6.4.1 B). Anatomical Characteristics Shared With: Mammals Fish Internal skeleton Warm-blooded Lungs Live birth Mammary glands/milk 4-chambered heart Internal skeleton Total # = 6 Total # = 1 2. in archaea and eukaryotes, a part of an mrna molecule that is removed before translation is called a(n). Odontocetes are distinguished from other whales by their hard sharp teeth (Figs. Some, like the North Atlantic right whale, have been slow to recover. Explain your answer. Good sense of hearing as mammals are aided with 3 middle ear bones. Anaerobic respiration provides a much lower energy output than aerobic respiration. Except for the monotremes (an egg-laying order of mammals comprising echidnas and the duck-billed platypus), all mammals are viviparousthey bear live young. This apparatus enables baleen whales to consume vast quantities of small prey in a single mouthful. Exploring Our Fluid Earth, a product of the Curriculum Research & Development Group (CRDG), College of Education. Pie chart of extant mammal species by order. What do the terms Theria, Metatheria, Eutheria, Monotremata, and Marsupialia mean? Summarize how the fossil cetacean ancestors changed over time. Chapter 29: Vertebrate Evolution Flashcards | Quizlet It is part of a group of mammals known as monotremes, which lay eggs and have specialized mouthparts. 6.8. Mammal | Definition, Characteristics, Classification, Examples, & Facts Flippers help to steer, while the back muscles, which are very large, drive the tail to propel the animal. 6.9. Abundant Animals: The Most Numerous Organisms in the World, NeoK12 - Educational Videos and Games for School Kids - Mammal, University of California Berkeley Museum of Paleontology - Hall of Mammals, mammal - Children's Encyclopedia (Ages 8-11), mammal - Student Encyclopedia (Ages 11 and up). Three other species within order Carnivora are considered to be marine mammals: the polar bear (Fig. They remotely resemble large fish, although whales and fish are not closely related. a. Fig. What does radial symmetry means? Corrections? They are free-living, very tiny organisms. 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. What are three shared features of vertebrates (other than those that are shared because they are chordates)?
how many anatomical characteristics do cetaceans share with mammals?