Final answer:
The renal pelvis is formed when the calyces unite, and it is the funnel-like end of the ureter where urine collects before it is transported through the ureter.
Step-by-step explanation:
The renal pelvis is formed when the calyces unite. The calyces are cup-like structures that receive urine from the collecting ducts and pass it on to the renal pelvis and ureter. The renal pelvis is the funnel-like end of the ureter where it enters the kidney and collects urine before it is transported through the ureter.