Provide definitions/explanations for the following terms:
$(1)$ Excretion
$(2)$ Renal pelvis
$(1)$ Excretion
$(2)$ Renal pelvis
(N/A) $(1)$ Excretion: The biological process by which nitrogenous metabolic wastes and other unwanted substances are eliminated from the body.
$(2)$ Renal pelvis: $A$ broad,funnel-shaped space located inner to the hilum of the kidney,which collects urine before it passes into the ureter.
$(2)$ Renal pelvis: $A$ broad,funnel-shaped space located inner to the hilum of the kidney,which collects urine before it passes into the ureter.
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