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  • Mammalian circadian systems: Organization and modern life . . .
    Organization of mammalian circadian systems Mammalian circadian clocks are organized hierarchically The suprachiasmatic nucleus (SCN) or pacemaker clock is superior to other body clocks as it is required for entrainment of the mammalian circadian system to the environmental light-dark cycle, as well as for driving rhythms in locomotor activity and hormones
  • Huge cache of mammal genomes offers fresh insights on human . . .
    The Amazon river dolphin (Inia geoffrensis) is one of 52 endangered species studied by the Zoonomia Project Credit: Kevin Schafer NPL When they were first published in the early 2000s, the
  • Bird Circulatory System | Heart, Structure Functions
    Birds are one of the few non-mammalian species to have a four-chambered heart While birds and mammals have the four-chambered heart in common, the bird heart has some key differences from the
  • SPECIATION IN MAMMALS AND THE GENETIC SPECIES CONCEPT
    A substantial portion of the remaining 30% are not large, highly vagile mammals; if large, highly vagile mammals have significantly fewer phylogroups than the species in Table 4, there will be a reduction in this estimate, but the overview will remain that there is a substantial number of unrecognized species of mammals
  • 7. 2 Circulatory systems in animals | Transport . . . - Siyavula
    Figure 7 2: Single circulation system as found in a typical fish species The red represents oxygen-rich or oxygenated blood, the blue represents oxygen-deficient or deoxygenated blood Double circulatory systems Double circulation pathways are found in birds and mammals Animals with this type of circulatory system have a four-chambered heart
  • Evolution of the 4 Heart Chambers in the Human Body - ThoughtCo
    The human heart is a large muscular organ with four chambers, a septum, and several valves necessary for pumping blood around the human body But this most vital of all organs is a product of evolution, perfecting itself to keep humans alive
  • Giraffe - Wikipedia
    The researchers suggested the existence of four species, which have not exchanged genetic information between each other for one to two million years [ 20 ] A 2020 study showed that depending on the method chosen, different taxonomic hypotheses recognizing from two to six species can be considered for the genus Giraffa





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