Which structure transports urine and semen outside of the animal?

• A. Rumen
• B. Epididymis
• C. Scrotum
• D. Urethra

Answer: (D)

The main idea is that the urethra is the shared exit for both urinary and reproductive fluids in males. It carries urine from the bladder to outside the body, and during ejaculation it also carries semen through the same tube to be expelled. This dual function is why the urethra is the structure that transports both urine and semen outside.

The other options don’t fit this role: the rumen is a stomach compartment involved in digestion, not fluid transport; the epididymis stores and matures sperm along the reproductive tract but does not convey urine; the scrotum is the external pouch that houses the testes and helps regulate temperature, not a conduit for exiting fluids.