homework - What is the difference between the Ureter and Urethra? also between the Renal papilla and Renal pelvis?

The ureters run from the kidneys to the bladder whilst the urethra runs from the bladder to exit the body:

The renal papillae are the site where urine drains into one of the minor calyxes of the kidney. Multiple minor calyxes join together into a major calyx, and multiple major calyxes join together to form the renal pelvis which then drains into the ureter.