urethra is an opening or a tube carrying urine, also what is the difference between urehtra and ureter

Solution:

Urethra is a transport tube that leads from the urinary bladder and discharge the urine outside the body. The urine leaves the human body from an exit hole found at the end of urethra called meatus.
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Urethra and ureter are both tubes in the urinary system, but have different functions:

•     Urethra is a tube that carries urine from the bladder to the outside of the body.
•     Ureter is a tube that carries urine from the kidney to the bladder.