In which of the following is a single circulation of the heart observed?

  • A
    Fishes
  • B
    Frogs
  • C
    Reptiles
  • D
    Humans

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What is the system called where blood vessels originate in capillaries and end in capillaries?

Which of the following is $NOT$ a characteristic feature of open circulation?

Closed circulatory system is found in $..........$.

Explain in short the mechanism of circulation in living organisms.

What is an open circulatory system?

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