The order Cetacea is divided into marine mammals with and without teeth. Of the toothed cetaceans, milk of a beluga whale and bottlenose dolphins have been analyzed. 3′-SL was the only free carbohydrate identified with certainty in beluga milk; however, because the milk sample was collected at...
【题目】阅读理解Although pangolins(穿山甲) are ancient mammals thathave existed for at least 50 million years, they are still lessevolved, with no teeth and poor vision. This makes theirlayer of scales(鳞片) their only “armor(铠甲)": When indanger, pangolins can curl up, and even lions ...
With this background, it should come as no surprise that considerable cynicism is emerging following the Minister’s announcement. Fears that another powerless pawn of the current government appear to have been realised with the appointment of Gregory Andrews as the Commissioner. Mr Andrews is a pu...
Most mammals have teeth, buthas no teeth.A. the elephantB. the fishC. the ant eaterD. the butterfly3.__iis the second largest mammal living on the land.A. The blue whaleB. The elephantC. The hippoD. The rhino4.are the most intelligent mammals.A. HumansB.ElephantsC.PigsD. ...
SummaryA growing requirement exists to determine the ages of the larger African mammals, concomitant with increasing management. Teeth offer the most practicable means of age determination, but no wholly reliable method, based on teeth, has been demonstrated. Tooth structure, growth and function, are...
If key characters were missing (e.g., teeth), specimens were identified to genus level. Mandibles found separately from skull were stored as well and identified to family level. After identification, data was digitalized in the MZNA database and the specimens were sealed in zip plastic bags ...
Baleen whales have no teeth. Their baleen consists of a series of plates that hang from the upper gumline in a direction that is perpendicular to the direction of water flow into the mouth. The plates are arranged in two groups, one on either side of the mouth. In a bowhead whale, the...
the most spectacular deviation from the basic Mesozoic mammalian body plan was Repenomamus, a three-foot-long, 25-pound carnivore that is the only mammal known to have fed on dinosaurs (a fossilized specimen of Repenomamus has been found with the remains of aPsittacosaurusin its stomach)....
material needed for confident estimation of maximum lifespan. Importantly, these are the earliest diphyodont taxa (Fig.2), with a single replacement of non-molar teeth and no molar tooth replacement31, and so estimates of lifespan are accurate to the time of the measured tooth-root formation...
morphological character matrix modified from several sources9,20,72,73. The pattern of ear evolution highlights three morphotypes of the middle ear (PAME, MAME, and DME) and three morphotypes of the incudomallear joint (QJ, OJ, and SSJ), coupled with the innovation of tribosphenic teeth in...