Question

what is single circulation and double circulation in an organism ?

Answer 1

in an organism there is only double circulation.
circulation b/n lungs and the pulmunary artery is known as pulmunary circulation and the circulation between heart and the body parts is known as systemic circulation..

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Answer 2

The blood gets oxygenated and is then supplied to the body parts from where the deoxgenated blood is returned to the heart is called Single Circulation

There is no mixing of oxygenated and deoxgenated blood and both flow simultaneously in heart chambers but separately, and is called Double Circulation.