Answer: Blood
Explanation:
In humans, circulation is carried out by the liquid called Blood.
Blood is considering the combination of main components of it which are plasma and cells. They are circulating through the body and that is their main function because in that way fluid is supplying essential substances around the body.
Those essential substances are oxygen, hormones, sugar, and more.
Blood is also having a function of removing waste from the cells that are found in the body.
