. The waste material excreted by kidneys, in liquid form is called
(d) All of the above
The wastes which are present in the blood has to be removed and this is done by kidneys. Kidneys have a number of blood-capillaries, which filters blood. When the blood reaches two kidneys both useful and harmful substances are present in it. The useful substances are absorbed back into blood and the wastes dissolved in water are removed as liquid called urine, through kidneys.