The human body has an organ A which act as pump . The organ A pumps a liquid B in to the whole body continously. The liquid B supplies the useful substance C and D to all the body cells and remove a waste E from the body cells
Identify the A,B,C,D

A- Heart
B- Blood
C- Nutrients
D- Oxygen
and although you have not mentioned E, I am writing that too. So,
E- Carbon dioxide/byproducts
Hope it Helps,

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A- Heart
B- Blood
C- Nutrients
D- Oxygen
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