Given a scientific question, generate a correct answer to it.

[Q]: Which bones are flat and triangular and located at the back of the pectoral girdle?
[A]: scapulae

[Q]: The urethra transports urine from what organ to the outside of the body for disposal?
[A]: bladder

[Q]: What is the term for the breakdown of unstable isotopes into stable elements?
[A]:
radioactive decay