Removal of blood and filtration through a machine to eliminate waste (urea) is called

Dialysis

Explanation:

Dialysis is a treatment process by which the blood filtered and purified by the machine. This process helps in maintaining the fluid and electrolytic balance of the blood when the kidney in the body becomes incapable of doing the biological function efficiently. This process helps in removing the waste like urea, extra water and salt from the body. This process also aid in maintaining the level of electrolytes such as potassium, bicarbonates and sodium which helps in controlling the blood pressure.

the unequal cytoplasmic division that  results  in  one egg  and three polar bodies ensures that a fertilized  egg has  ample nutrients  forits journey  to  the uterus.