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In the kidneys, both useful substances and wastes are removed from the blood by? A. reabsorption. B. excretion. C. dialysis. D. filtration

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Answer: D. filteration

Step-by-step explanation:

Kidneys are the two vital organs of human body. The primary function of kidneys is to expel out waste substances out of the body. Also, the useful substances when enters into kidneys through blood stream are selectively reabsorbed and transfered to blood stream. This process is called as filteration.

User Jordi Coscolla
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The correct answer for the question given above would be option D. In the kidneys, both useful substances and wastes are removed from the blood by filtration. In this process, the fluid in the blood is being filtered across the capillaries of the glomerulus and into the urinary space of the Bowman's capsule. 
User Immanuel
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