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Há 11 horas · The largest land mammal extant today is the African bush elephant. The largest extinct land mammal known was long considered to be Paraceratherium orgosensis , a rhinoceros relative thought to have stood up to 4.8 m (15.7 ft) tall, measured over 7.4 m (24.3 ft) long and may have weighed about 17 tonnes.
Há 11 horas · Handling the newts does no harm, but ingestion of even a minute fragment of skin is deadly. In feeding trials, fish, frogs, reptiles, birds, and mammals were all found to be susceptible. Mature adults of some salamander species have "nuptial" glandular tissue in their cloacae, at the base of their tails, on their heads or under their chins.
Há 11 horas · Like land mammals, the narwhal's neck vertebrae are jointed, instead of being fused together as in most whales; this allows a great range of neck flexibility. These characteristics—a dorsal ridge and jointed neck vertebrae—are shared by the beluga whale . [8]
Há 11 horas · Traditionally, living fossils are species that seem unchanged over long periods, resembling their ancient ancestors. However, many scientists argue this term is misleading, as it suggests ...
Há 11 horas · Mitochondrial DNA ( mtDNA or mDNA) [3] is the DNA located in mitochondria, cellular organelles within eukaryotic cells that convert chemical energy from food into a form that cells can use, such as adenosine triphosphate (ATP). Mitochondrial DNA is only a small portion of the DNA in a eukaryotic cell; most of the DNA can be found in the cell ...
Há 11 horas · In some species that synthesize ascorbate in the liver (including mammals and perching birds), the glucose is extracted from glycogen; ascorbate synthesis is a glycogenolysis-dependent process. In humans and in animals that cannot synthesize vitamin C, the enzyme l -gulonolactone oxidase (GULO), which catalyzes the last step in the biosynthesis, is highly mutated and non-functional.
Há 11 horas · 이러한 인간의 이중적 위치를 이해하기 위해서는 먼저 우리가 속한 포유류 동물군에 대해 알아야 할 것입니다. “그래서 포유류 (리암 드류 著, 고호관 譯, MID, 원제 : I, Mammal: The Story of What Makes Us Mammals)는 이 주제에 대한 훌륭한 입문서라고 할 수 있습니다.
