The blood vascular system of mammals is known as a double circulatory system because

  • A
    $A$ group of veins carries oxygenated blood and another group carries deoxygenated blood.
  • B
    Oxygenated blood passes through the heart twice in one complete cycle.
  • C
    The systemic and pulmonary circulations are completely separated.
  • D
    Blood passes through the heart twice in each complete cycle of the body.

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