Mammals are said to have a "double circulatory system". This means

  • A
    That the blood vessels are paired
  • B
    That there are two types of blood vessels attached to every organ; an artery and a vein
  • C
    That there are two systems; one from the heart to the lungs and back to the heart and other to and from the rest of the body
  • D
    That the blood circulates twice as quickly

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