Which of the following parts of the urinary system is/are a tubular structure leading from the urinary bladder to the outside of the body?

Common radioactive materials used in brachytherapy include radium-226, cobalt-60, cesium-137, and _______

Fill in the blank(s) with correct word

The waxy secretion from the ear, also known as earwax, is called ________. 

Fill in the blank(s) with the appropriate word(s).