What is the need for a circulatory system?

  • A
    To transport nutrients and oxygen to cells.
  • B
    To remove waste products from cells.
  • C
    Both $A$ and $B$.
  • D
    To provide structural support to the body.

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$(1)$ Fish : Single circulation :: Amphibians : ...........
$(2)$ Between right atrium and right ventricle : Tricuspid valve :: Between left atrium and left ventricle : .............

Which of the following cells phagocytose microorganisms rapidly?

Cardiac output is determined by.

The blood bank of the body or the reservoir where blood is stored and can be mobilized is:

The $.....$ is the blood bank of the body.

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