Think about the process of given options and relate to the excretory system.
Kidney has renal medulla, renal cortex, renal pelvis.
Think of the waste which comes out.
It is a part of the Excretory system which remove waste.
Think about the excretory system.
Think about the role of the system.
This is the most complex step of Excretion.
Think about the related processes.
Think about the system and find which one is not a part of the system.
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